K
Khách

Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.

41. "I'm very busy. I'll ring you tomorrow,” he said. He told me_________________________________________________________ 42. John could do his homework because his sister helped him. Without___________________________________________________________ 43. I. usually drive to work, but today I go by bus. Instead____________________________________________________________ 44. Mary will be happy to give you a hand. Mary does not mind_________________________________________________ 45....
Đọc tiếp

41. "I'm very busy. I'll ring you tomorrow,” he said.

He told me_________________________________________________________

42. John could do his homework because his sister helped him.

Without___________________________________________________________

43. I. usually drive to work, but today I go by bus.

Instead____________________________________________________________

44. Mary will be happy to give you a hand.

Mary does not mind_________________________________________________

45. Their knowledge of English is limited.

They______________________________________________________________

46. He could not sleep because the traffic was noisy.

The noise__________________________________________________________

47. More people live in New York than in Washington.

Not so____________________________________________________________

48. The police started investigating the case a week ago.

The police have_____________________________________________________

49. We never intended to travel abroad.

We never had_______________________________________________________

50. Immediately after his arrival, things went wrong.

No sooner_________________________________________________________

1
15 tháng 8 2017

41. "I'm very busy. I'll ring you tomorrow,” he said.

He told me___________________________he was very busy and he would ring me the following day______________________________

42. John could do his homework because his sister helped him.

Without_______________________his sister's help, John could not have done his homework____________________________________

43. I. usually drive to work, but today I go by bus.

Instead_______________________of driving to work, I go by bus today_____________________________________

44. Mary will be happy to give you a hand.

Mary does not mind_____________________giving you a hand____________________________

45. Their knowledge of English is limited.

They________________________don't know much of English______________________________________

46. He could not sleep because the traffic was noisy.

The noise_________________________of the traffic prevented him from sleeping_________________________________

47. More people live in New York than in Washington.

Not so___________________________many people live in Washington as in New York_________________________________

48. The police started investigating the case a week ago.

The police have__________________________investigated the case for a week___________________________

49. We never intended to travel abroad.

We never had___________________________any intention to travel abroad____________________________

50. Immediately after his arrival, things went wrong.

No sooner_______________________had he arrived than things went wrong__________________________________

26 tháng 12 2017

Ta có:\(\dfrac{11}{24}-\dfrac{5}{41}+\dfrac{13}{24}+0,5-\dfrac{36}{41}\)

\(=\left(\dfrac{11}{24}+\dfrac{13}{24}\right)-\left(\dfrac{5}{41}+\dfrac{36}{41}\right)+0,5\)

\(=1-1+0,5\)

\(=0,5\)

26 tháng 12 2020

Xin lỗi mình không biết làm bucminhkhocroigianroi

6 tháng 3 2017

I , Lý thuyết

Hạt kín là nhóm thực vật có hoa. Chúng có một số đặc điểm, chung như sau :

Cơ quan sinh dưỡng phát triển đa dạng (rễ cọc, rễ chùm, thân gỗ, thân cỏ, lá đơn, lá kép,...), trong thân cỏ mạch dẫn hoàn thiện.

Có hoa, quả. Hạt nằm trong quả (trước đó là noãn nằm trong bầu) là một ưu thế của các cây hạt kín, vì nó được bảo vệ tốt hơn. Hoa và quả có rất nhiều dạng khác nhau.

Môi trường sống đa dạng. Đây là nhóm thực vật tỉến hóa hơn cả.

II , Bài tập

Câu 1. Đặc điểm chung của thực vật hạt kín.

Trả lời: Cơ quan sinh dưỡng phát triển đa dạng (rễ cọc, rễ chùm thân gỗ thân thảo, lá đơn, lá kép..), trong thân có mạch dẫn phát triển. Có hoa quả, hạt nằm trong quả (trước đó là noãn nằm trong bầu). Đây là một đặc điểm tiến hóa và là ưu thế của cây Hạt kín (hạt được bảo vệ tốt hơn). Hoa và quả có rất nhiều dạng khác nhau.

Câu 2. Giữa cây Hạt trần và cây Hạt kín có những điểm gì phân biệt, trong đó điểm nào là quan trọng nhất ?

Trả lời:

Hạt trần

Hạt kín

- Rễ, thân, lá thật.

- Rễ thân, lá thật; rất đa dạng.

- Có mạch dẫn.

- Có mạch dẫn hoàn thiện.

- Chưa có hoa, quả. Cơ quan sinh sản là nón.

- Có hoa : Cơ quan sinh sản là hoa quả.

- Hạt nằm trên lá noãn hở.

- Hạt nằm trong quả.

Câu 3. Vì sao thực vật Hạt kín lại có thể phát triển đa dạng phong phú như ngày nay ? Trả lời:

Thực vật Hạt kín phát triển đa dạng phong phú vì chúng có những đặc điểm sau:

- Cơ quan sinh dưỡng phát triển đa dạng, trong thân có mạch dẫn phát triển hoàn thiện.

- Cây Hạt kín phân bố rộng rãi trên Trái Đất là nhờ có quả và hạt. Quả và hạt của chúng rất đa dạng và các kiểu phát tán khác nhau: tự phát tán, phát tán nhờ gió, phát tán nhờ nước, phát tán nhờ người hoặc động vật.

- Tính chất hạt kín là một ưu thế quan trọng của thực vật: giữ cho hạt khỏi bị tác hại bởi những điều kiện bất lợi của môi trường.

- Có khả năng thích nghi với những điều kiện môi trường sống khác nhau.

- Ngành Hạt kín rất lớn: chiếm tới quá nửa tổng số các loài thực vật.

Như thế thực vật Hạt kín phát triển da dạng phong phú nhất, phân bố rộng rãi nhất trên đất liền (một số loài mọc cả ở nước ngọt và nước mặn), giữ vai trò quan trọng nhất trong việc tạo ra các chất hữu cơ mà các sinh vật khác tiêu thụ. Câu 4. Kể tên 5 cây Hạt kín có dạng thân, lá hoặc hoa, quả khác nhau. Trả lời:

STT

Cây

Dạng thân

Dạng rễ

Kiểu lá

Gân lá

Quả (nếu có)

Môi trường sống

1

Bưởi

Gỗ

Cọc

đơn

Hình mạng

Mọng

ở cạn

2

Đậu

Cỏ

Cọc

Kép

Hình mạng

Khô, mở

ở cạn

3

Lúa

Cỏ

Chùm

đơn

Song song

Khô,đóng

ỏ cạn

4

Mướp

Leo

Chùm

đơn

Hình mạng

Mọng

ở cạn

5

Ổi

Gổ

Cọc

đơn

Hình mạng

Mọng

ở cạn

6 tháng 3 2017

Bạn tham khảo link này nha!!!

https://hoc24.vn/ly-thuyet/bai-41-hat-kin-dac-diem-cua-thuc-vat-hat-kin.1751/

41.I used to go to the cinema on Sunday. = I usually................................................ ................................. 42.How about painting the room light blue? =I suggest........................................................ .................................... 43.Linh is a better cook than Hoa. = Hoa can’t.......................................................................... ................................ 44.Nam lives quite near his aunt’s house. = Nam...
Đọc tiếp

41.I used to go to the cinema on Sunday. => I usually................................................ ................................. 42.How about painting the room light blue? =>I suggest........................................................ .................................... 43.Linh is a better cook than Hoa. => Hoa can’t.......................................................................... ................................ 44.Nam lives quite near his aunt’s house. => Nam doesn’t......................................................... ................................... 45.Study hard or you won’t pass the exam =>If ......................................................... ................................ 46-Long is a bad swimmer. =>Long swims………………………………………………………………………. 47-My brother cycles slowly. =>My brother is……………………………………………………………………… 48-Miss Lan is a fast runner. =>Miss Lan runs…………………………………………………………………….. 49-Mrs Oanh cooks well. => Mrs Oanh is………………………………………………………………………. 50-Khanh is a fluent English speaker. =>Khanh speaks…………………………………………………………………

1
3 tháng 9 2023

41. I usually went to the cinema on Sunday.

42. I suggest painting the room blue.

43. Hoa can't cook as good as Linh.

44. Nam doesn't live far from his aunt's house.

45. If you don't study hard, you won't pass the exam.

46. Long swims badly.

47. My brother is a slow cyclist.

48. Miss Lan runs fast.

49. Mrs.Oanh is a good cook.

50. Khanh speaks English fluently.

a: \(=4\cdot2\cdot6\cdot25\cdot7\cdot5\)

\(=\left(4\cdot25\right)\cdot\left(2\cdot5\right)\cdot\left(6\cdot7\right)\)

\(=42\cdot100\cdot10=42000\)

b: \(=16\cdot38-16\cdot2-38\cdot16+38\)

\(=-32+38=6\)

 

23 tháng 6 2018

Đáp án: A (hoành độ đỉnh là x = (-b)/2a = 6; tung độ đỉnh là y = (-Δ)/4a = 19).

Exercise  41. I met her while I was staying in Paris last summer.                                                           stay  I met her......................................................................in Paris last summer.2. I couldn't remember the name of my hotel when I got into the taxi.                                 called  I couldn't remember.............................................................when I got into the taxi.3. We were all surprised when she suddenly left the...
Đọc tiếp

Exercise  4

1. I met her while I was staying in Paris last summer.                                                           stay

  I met her......................................................................in Paris last summer.

2. I couldn't remember the name of my hotel when I got into the taxi.                                 called

  I couldn't remember.............................................................when I got into the taxi.

3. We were all surprised when she suddenly left the job.                                                      found

  All.................................................................when she suddenly left the job.

4. "Are you a member of the club?" the receptionist said to me.                                          belonged

  The receptionist asked.............................................................the club.

5. This is the most amusing book I've ever read.                                                                   amusing

  I've never read a............................................................. one before.

6. Do shops usually stay open so late in this country?                                                           usual

  Is.........................................................stay open so late in this country?

7. He doesn't often find it difficult to earn money.                                                                trouble

  He seldom............................................................money.

8. You're like another person I've met here recently.                                                                        else

  You remind.......................................................I've met here recently.

9. Do you think that climate affects people's personalities?                                                 influence

  Do you think that climate............................................................. people's personalities?

10. Jack has become confident as a result of his success.                                                     turned

   Jack's success has............................................................. person.

 

 

 

 

Exercise 5

1. He didn't give any reason for his strange behaviour that day.                                           behaved

   He didn't explain..........................................such a strange way that day.

2. Was the film as good as you expected it to be or was it disappointing?                           live

  Did the film.....................................................of it or was it disappointing?

3. It is said that these herbs are good for you.                                                                        said

  These herbs.............................................................good.

4. In spite of working until very late, I couldn't complete the task.                                      fact

  Despite.............................................................until very late, I couldn't complete the task.

5. 'If you don't apologize immediately, I'm leaving,' she told him.                                       threatened

  She.............................................................he apologized immediately.

6. You can't blame me for your stupid mistakes.                                                                   fault

  It isn't.............................................................stupid mistakes.

7. The news was such a shock to us that we all sat there without saying a word.               silence

  We all sat there......................................................so shocked by the news.

8. If you don't hurry, you'll miss your bus.                                                                             better

  I think.........................................................you'll miss your bus.

9. I learnt quite a lot of the language simply by listening to other people.                           fair

  I picked........................................................the language simply by listening to other people.

10. Mike hates other people criticizing him.                                                                                     stand          

  Mike.........................................................other people criticize him.

 

1
19 tháng 6 2021

Exercise  4

1. I met her while I was staying in Paris last summer.                                                           stay

  I met her........................during my stay..............................................in Paris last summer.

2. I couldn't remember the name of my hotel when I got into the taxi.                                 called

  I couldn't remember.............what my hotel was called................................................when I got into the taxi.

3. We were all surprised when she suddenly left the job.                                                      found

  All........................of us found it surprising.........................................when she suddenly left the job.

4. "Are you a member of the club?" the receptionist said to me.                                          belonged

  The receptionist asked..................me whether I belonged to...........................................the club.

5. This is the most amusing book I've ever read.                                                                   amusing

  I've never read a....................more amusing book than this......................................... one before.

6. Do shops usually stay open so late in this country?                                                           usual

  Is...............................it usual for shops to..........................stay open so late in this country?

7. He doesn't often find it difficult to earn money.                                                                trouble

  He seldom...................has trouble earning.........................................money.

8. You're like another person I've met here recently.                                                                        else

  You remind...................... me of someone else .................................I've met here recently.

9. Do you think that climate affects people's personalities?                                                 influence

  Do you think that climate....................can have an influence on......................................... people's personalities?

10. Jack has become confident as a result of his success.                                                     turned

   Jack's success has......................turned him into a confident....................................... person.

Exercise 5

1. He didn't give any reason for his strange behaviour that day.                                           behaved

   He didn't explain................why he had behaved in..........................such a strange way that day.

2. Was the film as good as you expected it to be or was it disappointing?                           live

  Did the film....................live up to your expectation.................................of it or was it disappointing?

3. It is said that these herbs are good for you.                                                                        said

  These herbs..................are said to do you...........................................good.

4. In spite of working until very late, I couldn't complete the task.                                      fact

  Despite..........................the fact that I worked...................................until very late, I couldn't complete the task.

5. 'If you don't apologize immediately, I'm leaving,' she told him.                                       threatened

  She............................threatened to leave unless.................................he apologized immediately.

6. You can't blame me for your stupid mistakes.                                                                   fault

  It isn't............................. my fault that you make................................stupid mistakes.

7. The news was such a shock to us that we all sat there without saying a word.               silence

  We all sat there.......................in silence because we were...............................so shocked by the news.

8. If you don't hurry, you'll miss your bus.                                                                             better

  I think............................you had better hurry or.............................you'll miss your bus.

9. I learnt quite a lot of the language simply by listening to other people.                           fair

  I picked....................up a fair bit of....................................the language simply by listening to other people.

10. Mike hates other people criticizing him.                                                                                     stand          

  Mike.............................. can't stand it when...........................other people criticize him.

 

26 tháng 4 2017

Chọn A.

13 tháng 5 2019

11 tháng 9 2021

felt