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14 tháng 12 2018

Ex1:

1)A man in Sri Lanka watches TV more than any other man in the world

=>Nobody in the world watches tv more than A man in Sri Lanka

2)We do a lot of outdoor activities in summer .

=>We take part in outdoor activities in summer .

3)I won't be able to do anything unless I havea quiet room.

=>If i have a quiet roo, i will be able to do

Ex2:Dựa vào từ viết hoàn chỉnh câu

1)in the future robots will be able to do many things humans

2)i went to the library last night and i will probably go there tonight,too

3)There might not be a meeting this afternoon because the director is ill

5)Where is the new remote control that I bought last week?

6)Hoa s eating noodles but her mother always cooks rice for her

Ex3:Đặt câu hỏi cho phần đc in đậm

1.................Where did Tom put the remote control.....................?

Tom put the remote control on the bookshelf

2..............How often do they go to English club ?......................?

They go to the Engish club twice a week

3.................Why did she miss a week's lessons ?.....................?

She missed a week's lesons because of illness

5...................How does that newsreader usually get to work ? ...................?

That newsreader usually gets to work by bus

6...............How long did the game show last ?....................?

The game show lasted for two hours and a half

14 tháng 12 2018

1.................Where did Tom put the remote control.....................?

Tom put the remote control on the bookshelf

2..............How often do they go to English club ?......................?

They go to the Engish club twice a week

3.................Why did she miss a week's lessons ?.....................?

She missed a week's lesons because of illness

5...................How does that newsreader usually get to work ? ...................?

That newsreader usually gets to work by bus

6...............How long did the game show last ?....................?

The game show lasted for two hours and a half

DisTrả lời

1 ngày trước

5 tháng 1 2018

Hoàn thành câu với dạng đúng của từ trong ngoặc:

1.Many fish in the lake near my house have died because of the polluted water. (pollute)

2.My friend and I are going to give a presentation about our environmental problems. (environment)

3.Too much use of electric lights in cities may cause light pollution. (electricity)

4.Nowadays, people use too much herbicide so many animals don't have enough food and they become sick . (sickness)

5. Oil spills from ships in oceans and rivers lead to the death of many aquatic animals and plants. (die)

Tet or lunar new year is the main holiday for vietnamese people. It is the most important celebration in the year which falls sometimes between January 19 and Februay 20. Tet mark the beginning of spring and it a time for family members who live apart try to be together The preparatios and celebrations used to be spread over months but nowadays the holiday is much shorter. However there is great excitement building up well before tet. Street are decorated with colored lights and Red bananers...
Đọc tiếp

Tet or lunar new year is the main holiday for vietnamese people. It is the most important celebration in the year which falls sometimes between January 19 and Februay 20. Tet mark the beginning of spring and it a time for family members who live apart try to be together

The preparatios and celebrations used to be spread over months but nowadays the holiday is much shorter. However there is great excitement building up well before tet. Street are decorated with colored lights and Red bananers shops are full of goods. People are busy buying gifts cleaning and secorating their house and cooking traditional foods

On the first day of tet people try to be nice and polite to others they visit their relatives or friends and exchange new year wishes. Children receive the lucky money inside Red envelopes many people go to the pagoda to pray for a happy new year for theselves their family. Tet is really a time of fun and festivals throughout the country

1/ When is Tet holiday in Viet Nam ?

..........................................................................................................................................................................................

2/ is Tet holiday nowadays longer or shorter than before ?

..........................................................................................................................................................................................

3/ What are people busy doing before Tet ?

..........................................................................................................................................................................................

4/What are streets decorater with ?

........................................................................................................................................................................................

5/ What do children often receive on the fist day of Tet ?

..........................................................................................................................................................................................

6/ Where do people go to pray for a happy new year ?

..........................................................................................................................................................................................

1
11 tháng 6 2020

Tet or lunar new year is the main holiday for vietnamese people. It is the most important celebration in the year which falls sometimes between January 19 and Februay 20. Tet mark the beginning of spring and it a time for family members who live apart try to be together

The preparatios and celebrations used to be spread over months but nowadays the holiday is much shorter. However there is great excitement building up well before tet. Street are decorated with colored lights and Red bananers shops are full of goods. People are busy buying gifts cleaning and secorating their house and cooking traditional foods

On the first day of tet people try to be nice and polite to others they visit their relatives or friends and exchange new year wishes. Children receive the lucky money inside Red envelopes many people go to the pagoda to pray for a happy new year for theselves their family. Tet is really a time of fun and festivals throughout the country

1/ When is Tet holiday in Viet Nam ?

Between January 19 and Februay 20

2/ is Tet holiday nowadays longer or shorter than before ?

Nowadays the holiday is much shorter.

3/ What are people busy doing before Tet ?

People are busy buying gifts , cleaning and decorating their house and cooking traditional foods.

4/What are streets decorater with ?

Street are decorated with colored lights

5/ What do children often receive on the fist day of Tet ?

Children receive the lucky money inside red envelopes

6/ Where do people go to pray for a happy new year ?

They go to the pagoda to pray for a happy new year

#Yumi

câu 1 : đọc đoạn văn và hoàn thành thông tin với các từ cho sẵn trong khung : showed - associated - so that - traditional - for - survived - who - hard Thanksgiving Thanksgiving is celebrated in the US on the fourth Thursday in November. (1)............many Americans it is the most important holiday apart from christmas schools, offices and most businesses close for Thanksgiving, and many people make the whole weekend a vacation. Thanksgiving is...
Đọc tiếp

câu 1 : đọc đoạn văn và hoàn thành thông tin với các từ cho sẵn trong khung :

showed - associated - so that - traditional - for - survived - who - hard

Thanksgiving

Thanksgiving is celebrated in the US on the fourth Thursday in November. (1)............many Americans it is the most important holiday apart from christmas schools, offices and most businesses close for Thanksgiving, and many people make the whole weekend a vacation. Thanksgiving is (2)..............with the time when europeans fist came to North America. In 1620 the ship the Mayflowers arrived, bringing about 150 people (3).............. today are usually called pilgrims. They arrived at the beginning of a very (4)..............winter and could not find enough to eat , so many of them died. But in the following summer native Americans (5).............. them what foods were safe to eat (6)............they could save food for the next winter. They held a big celebration to thank god and the native Americans for the fact that they had (7)............... Today people celebrate Thanksgiving to remember these early days the most important part of the celebration is a (8)............ dinner with foods that come from north America

bài 2 : đọc đoạn văn và hoàn thành thông tin

Vietnamese's New Year is (1).........according to the Lunar calendar. It is (2)............know as the Lunar New Year or Tet. It occurs in (3)............. january or early February. The exact date changes (4).................year to year . Vietnanese people usually make (5)..............for Tet holiday several weeks boforehand . They clean and decorate their homes, cook special food such as (6)...............rice cakes, and make(7).................on the family altars. On the New Year's Eve, the whole family(8)............together for the reunion dinner in which many different kinds of dishes are served. On Tet, people usually(9)............their new clothes, give one another the Tet season's greetings, and pay(10)............vistis

bài 3 :đọc đoạn văn và hoàn thành thông tin với các từ cho sẵn trong khung

wives - shapes - on - to - difference - cards- national - buy

Valentine's Day is always on February 14 .It's not a (1).................day. On weekdays, schools are open. Banks are open. People go to work. Life gose (2).....................as usual, but there is one(3)..................people give cards and gifts to friends and people they love. They say '' Be may Valentine'' . There are many kinds of Valentine cards. Some people make cards. Most people (4)................them. Men ad women often give each another romantic cards. There(5)................say, ' I love you' The husbands give cards to their(6)....................

Childen and friends usually give funny and humorous cards. These cards do not say 'I love you' They are not romantic. Children give cards to their friends school parties. Flowers and candies are popular gifts on Valentine's day . Many people give red roses (7)....................people they love . Stores sell chocolates and other candies in heart (8)................

Bài 4 :Hoàn thành các câu bên dưới

Tet is a national and traditional festival in Vietnam. It is an occasion for every Vietnamese to bereturned to thik about their past activities and hope for good luck when the year to come . Before Tet all houses are white washed and decorated with yellow apricot flowers and colorful lanterns everybody is looking forward to a more favorite life on New Year's Eve, children are smartly dressed . They are hoping to receive money put in small red envelope as they are wishing longevity to their grandparents and parents. Wrong doings should be absolutely avoidedon these days

1/..................................Tet is a national and traditional fetival

2/ Before tet all houses.................................with yellow apricot flowers and colorful lanterns

3/ Everybody is looking forward to.......................................

4/...................................children are smartly dressed and they are hoping..........................put in small red envelopes

Bài 5 : hoàn thành các câu bên dưới :

Viet Nam's New year is celebrated according to the Lunar calendar. It's officially known as Tet6s Nguyên Đán or Tet. It begins between January twenty - first and February nineteenth. the exact date changes from year to year . Vietnamese people usually make preparations for the holiday several weeks beforehand . They tidy their houses, cook special food, clean and make offerings on the family altars . On the New Year'Eve, people sit up to midnight to see the New Year coming up, then they put on new clothes and give one another the greetings of the season

1/ Viet Nam's New Year is celebrated acoording to................................

2/ Tet begins....................................

3/ People usually........................................

4/ People sit up midnight to.........................................

1
18 tháng 4 2019

Bài 4 :Hoàn thành các câu bên dưới

Tet is a national and traditional festival in Vietnam. It is an occasion for every Vietnamese to bereturned to thik about their past activities and hope for good luck when the year to come . Before Tet all houses are white washed and decorated with yellow apricot flowers and colorful lanterns everybody is looking forward to a more favorite life on New Year's Eve, children are smartly dressed . They are hoping to receive money put in small red envelope as they are wishing longevity to their grandparents and parents. Wrong doings should be absolutely avoidedon these days

1/ in Vietnam Tet is a national and traditional fetival

2/ Before tet all houses...........are white washed and decorated ......................with yellow apricot flowers and colorful lanterns

3/ Everybody is looking forward to............a more favorite life on New Year's Eve, children are smartly dressed...........................

4/.................everybody is looking forward ..................children are smartly dressed and they are hoping..............to receive money ............put in small red envelopes

Bài 5 : hoàn thành các câu bên dưới :

Viet Nam's New year is celebrated according to the Lunar calendar. It's officially known as Tet6s Nguyên Đán or Tet. It begins between January twenty - first and February nineteenth. the exact date changes from year to year . Vietnamese people usually make preparations for the holiday several weeks beforehand . They tidy their houses, cook special food, clean and make offerings on the family altars . On the New Year'Eve, people sit up to midnight to see the New Year coming up, then they put on new clothes and give one another the greetings of the season

1/ Viet Nam's New Year is celebrated acoording to the Lunar calendar

2/ Tet begins between January twenty - first and February nineteenth.

3/ People usually make preparations for the holiday several weeks beforehand

4/ People sit up midnight to see the New Year coming up

#Yumi

Đọc và trả lời các câu hỏi Tet, one of the most important festivals in Vietnam , usually occurs around the end of January and the beginning of february or on the fist days based on the lunar calendar . Tet holiday is a wonderful occasion for Vietnamese families to celebrate in which people will dress new fancy clothes,reunite together, and serve some special traditional food . Vietnamese people usually dress new clothes during Tet holiday. The clothing in this occasion is spacial and...
Đọc tiếp

Đọc và trả lời các câu hỏi

Tet, one of the most important festivals in Vietnam , usually occurs around the end of January and the beginning of february or on the fist days based on the lunar calendar . Tet holiday is a wonderful occasion for Vietnamese families to celebrate in which people will dress new fancy clothes,reunite together, and serve some special traditional food . Vietnamese people usually dress new clothes during Tet holiday. The clothing in this occasion is spacial and colorful. Adults wear "Ao dai " while chidren wear new and fashionable clothes which their parents usually buy for them before Tet. Moreover , the warm atmosphere of the reunion that it brings to families is also an imporant thing to know about Tet. They give the greeting wishes to each other . Children may be the most excited because they can receive lucky money from the elders. One of the most meaningful things about Tet is united meal because people can enjoy traditional food together such as Banh Chung , Banh Tet , Vietnamese sausage , sticky rice or candied fruits

1.When does tet take place ?

2.Do both adults and children wear the traditional dress at Tet ?

3.Why are children so excited about Tet ?

4.What do Vietnamese people often do in the fist morning of tet?

5.According to the passage , what are specialities people can enjoy at Tet?

1
28 tháng 4 2018

Đọc và trả lời các câu hỏi

Tet, one of the most important festivals in Vietnam , usually occurs around the end of January and the beginning of february or on the fist days based on the lunar calendar . Tet holiday is a wonderful occasion for Vietnamese families to celebrate in which people will dress new fancy clothes,reunite together, and serve some special traditional food . Vietnamese people usually dress new clothes during Tet holiday. The clothing in this occasion is spacial and colorful. Adults wear "Ao dai " while chidren wear new and fashionable clothes which their parents usually buy for them before Tet. Moreover , the warm atmosphere of the reunion that it brings to families is also an imporant thing to know about Tet. They give the greeting wishes to each other . Children may be the most excited because they can receive lucky money from the elders. One of the most meaningful things about Tet is united meal because people can enjoy traditional food together such as Banh Chung , Banh Tet , Vietnamese sausage , sticky rice or candied fruits

1.When does tet take place ?

It takes place around the end of January and the beginning of february or on the first day based on the lunar calendar

2.Do both adults and children wear the traditional dress at Tet ?

No, they don't

3.Why are children so excited about Tet ?

Because they can receive lucky money from the elders

4.What do Vietnamese people often do in the fist morning of tet?

They give the greeting wishes to each other

5.According to the passage , what are specialities people can enjoy at Tet?

People can enjoy traditional food together such as Banh Chung , Banh Tet , Vietnamese sausage , sticky rice or candied fruits

Read the following passage and mark the letter A, B, C, or D on your answer sheer to indicate the correct answer to each of the numbered blanks from 37 to 44. All mammals feed their young. Beluga whale mothers, for example, nurse their calves for some twenty months, until they are about to give birth again and their young are able to find their own food. The behavior of feeding of the young is built into the reproductive system. It is a nonselective part of parental care and the defining...
Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheer to indicate the correct answer to each of the numbered blanks from 37 to 44.

All mammals feed their young. Beluga whale mothers, for example, nurse their calves for some twenty months, until they are about to give birth again and their young are able to find their own food. The behavior of feeding of the young is built into the reproductive system. It is a nonselective part of parental care and the defining feature of a mammal, the most important thing that mammals – whether marsupials, platypuses, spiny anteaters, or placental mammals – have in common.

But not all animal parents, even those that tend their offspring to the point of hatching or birth, feed their young. Most egg–guarding fish do not for the simple reason that their young are so much smaller than the parents and eat food that is also much smaller than the food caten by adults. In reptiles, the crocodile mother protects her young after they have hatched and takes them down to the water, where they will find food, but she does not actually feed them. Few insects feed their young after hatching, but some make other arrangement provisioning their cells and nests with caterpillars and spiders that they have paralyzed with their venom and stored in a state of suspended animation so that their larvae might have a supply of fresh food when they hatch.

For animals other than mammals, then, feeding is not intrinsic to parental care. Animals add it to their reproductive strategies to give them an edge in their lifelong quest for descendants. The most vulnerable moment in any animal's life is when it first finds itself completely on its own, when it must forage and fend for itself. Feeding postpones that moment until a young animal has grown to such a size that it is better able to cope.

Young that are fed by their parents become nutritionally independent at a much greater fraction of their full adult size. And in the meantime those young are shielded against the vagaries of fluctuating of difficult–to–find supplies. Once a species does take the step of feeding its young, the young become totally dependent on the extra effort. If both parents are removed, the young generally do not survive.

The author lists various animals in the first paragraph to ________ . 

A. contrast the feeding habits of different types of mammals 

B. describe the process by which mammals came to be defined 

C. emphasize the point that every type of mammal feeds its own 

D. explain why a particular feature of mammals is nonselective

1
20 tháng 3 2019

Kiến thức: Đọc hiểu

Giải thích:

Tác giả liệt kê các động vật khác nhau trong đoạn đầu tiên tới ____.

   A. tương phản thói quen ăn uống của các loại động vật có vú khác nhau

   B. mô tả quá trình xác định động vật có vú

   C. nhấn mạnh điều mà mọi loại động vật có vú đều nuôi con non

   D. giải thích tại sao một tính năng đặc biệt của động vật có vú là không chọn lọc

Thông tin: All mammals feed their young.

Tạm dịch: Tất cả các động vật có vú nuôi con non của chúng

Chọn C

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the answer to each of the following questions.All mammals feed their young. Beluga whale mothers, for example, nurse their calves for some twenty months, until they are about to give birth again and their young are able to find their own food. The behavior of feeding of the young is built into the reproductive system. It is a nonselective part of parental care and the defining feature of a mammal, the...
Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the answer to each of the following questions.

All mammals feed their young. Beluga whale mothers, for example, nurse their calves for some twenty months, until they are about to give birth again and their young are able to find their own food. The behavior of feeding of the young is built into the reproductive system. It is a nonselective part of parental care and the defining feature of a mammal, the most important thing that mammals-- whether marsupials, platypuses, spiny anteaters, or placental mammals -- have in common.

But not all animal parents, even those that tend their offspring to the point of hatching or birth, feed their young. Most egg-guarding fish do not, for the simple reason that their young are so much smaller than the parents and eat food that is also much smaller than the food eaten by adults. In reptiles, the crocodile mother protects her young after they have hatched and takes them down to the water, where they will find food, but she does not actually feed them. Few insects feed their young after hatching, but some make other arrangement, provisioning their cells and nests with caterpillars and spiders that they have paralyzed with their venom and stored in a state of suspended animation so that their larvae might have a supply of fresh food when they hatch.

For animals other than mammals, then, feeding is not intrinsic to parental care. Animals add it to their reproductive strategies to give them an edge in their lifelong quest for descendants. The most vulnerable moment in any animal's life is when it first finds itself completely on its own, when it must forage and fend for itself. Feeding postpones that moment until a young animal has grown to such a size that it is better able to cope. Young that are fed by their parents become nutritionally independent at a much greater fraction of their full adult size. And in the meantime those young are shielded against the vagaries of fluctuating of difficult-to-find supplies. Once a species does take the step of feeding its young, the young become totally dependent on the extra effort. If both parents are removed, the young generally do not survive.

The author lists various animals in line 5 to ________

A. contrast the feeding habits of different types of mammals

B. describe the process by which mammals came to be defined

C. emphasize the point that every type of mammal feeds its own young

D. explain why a particular feature of mammals is nonselective

1
17 tháng 10 2017

Đáp án C

Tác giả liệt kê các loài động vật khác nhau trong dòng 5 để ________

A. đối chiếu thói quen ăn uống của các loại động vật có vú khác nhau

B. mô tả quá trình mà các động vật có vú đã được xác định

C. nhấn mạnh rằng mọi loại động vật có vú đều nuôi dưỡng con của chúng

D. giải thích lý do tại sao một đặc điểm đặc biệt của động vật có vú là không chọn lọc

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions .         All mammals feed their young. Beluga whale mothers, for example, nurse their calves for some twenty months, until they are about to give birth again and their young are able to find their own food. The behavior of feeding of the young is built into the reproductive system. It is a nonelective part of parental care and the defining feature of a...
Đọc tiếp

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions .

         All mammals feed their young. Beluga whale mothers, for example, nurse their calves for some twenty months, until they are about to give birth again and their young are able to find their own food. The behavior of feeding of the young is built into the reproductive system. It is a nonelective part of parental care and the defining feature of a mammal, the most important thing that mammals-- whether marsupials, platypuses, spiny anteaters, or placental mammals -- have in common.

But not all animal parents, even those that tend their offspring to the point of hatching or birth, feed their young. Most egg-guarding fish do not, for the simple reason that their young are so much smaller than the parents and eat food that is also much smaller than the food eaten by adults. In reptiles, the crocodile mother protects her young after they have hatched and takes them down to the water, where they will find food, but she does not actually feed them. Few insects feed their young after hatching, but some make other arrangement, provisioning their cells and nests with caterpillars and spiders that they have paralyzed with their venom and stored in a state of suspended animation so that their larvae might have a supply of fresh food when they hatch.

            For animals other than mammals, then, feeding is not intrinsic to parental care. Animals add it to their reproductive strategies to give them an edge in their lifelong quest for descendants. The most vulnerable moment in any animal's life is when it first finds itself completely on its own, when it must forage and fend for itself. Feeding postpones that moment until a young animal has grown to such a size that it is better able to cope. Young that are fed by their parents become nutritionally independent at a much greater fraction of their full adult size. And in the meantime those young are shielded against the vagaries of fluctuating of difficult-to-find supplies. Once a species does take the step of feeding its young, the young become totally dependent on the extra effort. If both parents are removed, the young generally do not survive

The author lists various animals in line 5 to

A. contrast the feeding habits of different types of mammalsB. describe the process by which mammals came to be defined

B. describe the process by which mammals came to be defined

C. emphasize the point that every type of mammal feeds its own young

D. explain why a particular feature of mammals is nonelective

1
20 tháng 5 2017

Đáp án : C

Từ dòng 3: It is a nonelective part of parental care and the defining feature of a mammal, the most important thing that mammals-- whether marsupials, platypuses, spiny anteaters, or placental mammals -- have in common -> các loài thú có vú (như đã liệt kê) đều có đặc điểm quan trọng này (cho ăn) -> đây là đặc điểm tự nhiên, không phải qua chọn lọc

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the answer to each of the following questions.All mammals feed their young. Beluga whale mothers, for example, nurse their calves for some twenty months, until they are about to give birth again and their young are able to find their own food. The behavior of feeding of the young is built into the reproductive system. It is a nonselective part of parental care and the defining feature of a mammal, the...
Đọc tiếp

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the answer to each of the following questions.

All mammals feed their young. Beluga whale mothers, for example, nurse their calves for some twenty months, until they are about to give birth again and their young are able to find their own food. The behavior of feeding of the young is built into the reproductive system. It is a nonselective part of parental care and the defining feature of a mammal, the most important thing that mammals-- whether marsupials, platypuses, spiny anteaters, or placental mammals -- have in common.

But not all animal parents, even those that tend their offspring to the point of hatching or birth, feed their young. Most egg-guarding fish do not, for the simple reason that their young are so much smaller than the parents and eat food that is also much smaller than the food eaten by adults. In reptiles, the crocodile mother protects her young after they have hatched and takes them down to the water, where they will find food, but she does not actually feed them. Few insects feed their young after hatching, but some make other arrangement, provisioning their cells and nests with caterpillars and spiders that they have paralyzed with their venom and stored in a state of suspended animation so that their larvae might have a supply of fresh food when they hatch.

For animals other than mammals, then, feeding is not intrinsic to parental care. Animals add it to their reproductive strategies to give them an edge in their lifelong quest for descendants. The most vulnerable moment in any animal's life is when it first finds itself completely on its own, when it must forage and fend for itself. Feeding postpones that moment until a young animal has grown to such a size that it is better able to cope. Young that are fed by their parents become nutritionally independent at a much greater fraction of their full adult size. And in the meantime those young are shielded against the vagaries of fluctuating of difficult-to-find supplies. Once a species does take the step of feeding its young, the young become totally dependent on the extra effort. If both parents are removed, the young generally do not survive.

According to the passage, animal young are most defenseless when

A. their parents are away searching for food

B. their parents have many young to feed

C. they are only a few days old

D. they first become independent

1
22 tháng 3 2018

Đáp án D

Theo đoạn văn, động vật nhỏ không có khả năng tự vệ nhất khi

The most vulnerable moment in any animal's life is when it first finds itself completely on its own, when it must forage and fend for itself.

A. cha mẹ của chúng đang đi tìm thức ăn

B. cha mẹ của chúng có nhiều đứa để nuôi

C. chúng chỉ là một vài ngày tuổi

D. chúng lần đầu tiên trở nên độc lập

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions .         All mammals feed their young. Beluga whale mothers, for example, nurse their calves for some twenty months, until they are about to give birth again and their young are able to find their own food. The behavior of feeding of the young is built into the reproductive system. It is a nonelective part of parental care and the defining feature of a...
Đọc tiếp

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions .

         All mammals feed their young. Beluga whale mothers, for example, nurse their calves for some twenty months, until they are about to give birth again and their young are able to find their own food. The behavior of feeding of the young is built into the reproductive system. It is a nonelective part of parental care and the defining feature of a mammal, the most important thing that mammals-- whether marsupials, platypuses, spiny anteaters, or placental mammals -- have in common.

But not all animal parents, even those that tend their offspring to the point of hatching or birth, feed their young. Most egg-guarding fish do not, for the simple reason that their young are so much smaller than the parents and eat food that is also much smaller than the food eaten by adults. In reptiles, the crocodile mother protects her young after they have hatched and takes them down to the water, where they will find food, but she does not actually feed them. Few insects feed their young after hatching, but some make other arrangement, provisioning their cells and nests with caterpillars and spiders that they have paralyzed with their venom and stored in a state of suspended animation so that their larvae might have a supply of fresh food when they hatch.

            For animals other than mammals, then, feeding is not intrinsic to parental care. Animals add it to their reproductive strategies to give them an edge in their lifelong quest for descendants. The most vulnerable moment in any animal's life is when it first finds itself completely on its own, when it must forage and fend for itself. Feeding postpones that moment until a young animal has grown to such a size that it is better able to cope. Young that are fed by their parents become nutritionally independent at a much greater fraction of their full adult size. And in the meantime those young are shielded against the vagaries of fluctuating of difficult-to-find supplies. Once a species does take the step of feeding its young, the young become totally dependent on the extra effort. If both parents are removed, the young generally do not survive

According to the passage, animal young are most defenseless when

A. their parents are away searching for food

B. their parents have many young to feed

C. they are only a few days old

D. they first become independent

1
28 tháng 12 2018

Đáp án : D

Từ cuối dòng 2: The most vulnerable moment in any animal's life is when it first finds itself completely on its own, when it must forage and fend for itself -> khoảnh khắc dễ tổn thương nhất là lần đầu nó tự thấy mình tự lập