K
Khách

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

1. This stick is used for_________the amount of oil in the engine- do you see the marks on it ?(measurement) 2. Such a war would be_______for the country(disaster) 3. Among the undergraduates___________ or strong winds (ranked 45th scored by 15% of sample) and earthquakes (48th; 12%) are rarely dreamed about(tornardo) 4. It was a frightening sight for Pliny to see the volcanic_____of Mr. Vesuvius (erupt) 5. The mountain was full of________rock and ash when the eruption was over...
Đọc tiếp

1. This stick is used for_________the amount of oil in the engine- do you see the marks on it ?(measurement) 2. Such a war would be_______for the country(disaster) 3. Among the undergraduates___________ or strong winds (ranked 45th scored by 15% of sample) and earthquakes (48th; 12%) are rarely dreamed about(tornardo) 4. It was a frightening sight for Pliny to see the volcanic_____of Mr. Vesuvius (erupt) 5. The mountain was full of________rock and ash when the eruption was over (volcano) 6. When the fire occurred. I was fast______(sleep) 7. Mr. Robinson is a _______.He presents weather reports on TV every night(weather) 8. I can never make up stories - I have absolutely no_____(image) 9.________waves are one of the great forces of nature They can be very dangerous to people.(tide) 10. Tsunamis, earthquakes and typhoons are ____disasters(nature) 11. A typhoon is going to hit our area. What sorts of _________ shall we make?(prepare ) 12 Canned food is very convenient for campers.(can 13. Today _____ can predict when a tidal w will hit land. (science) 14. The________of 4 million unemployed now looks horrifyingly realis (predict) 15.A legal fight has_____between two of the world's larget oil companies (eruption) 16.With dramatic ______,a decision was taken to close the school for good (abrupt) 17.Geologist understand many of the factors that cause_____eruptions (volcano)

0
1. This stick is used for_________the amount of oil in the engine- do you see the marks on it ?(measurement) 2. Such a war would be_______for the country(disaster) 3. Among the undergraduates___________ or strong winds (ranked 45th scored by 15% of sample) and earthquakes (48th; 12%) are rarely dreamed about(tornardo) 4. It was a frightening sight for Pliny to see the volcanic_____of Mr. Vesuvius (erupt) 5. The mountain was full of________rock and ash when the eruption was over...
Đọc tiếp

1. This stick is used for_________the amount of oil in the engine- do you see the marks on it ?(measurement) 2. Such a war would be_______for the country(disaster) 3. Among the undergraduates___________ or strong winds (ranked 45th scored by 15% of sample) and earthquakes (48th; 12%) are rarely dreamed about(tornardo) 4. It was a frightening sight for Pliny to see the volcanic_____of Mr. Vesuvius (erupt) 5. The mountain was full of________rock and ash when the eruption was over (volcano) 6. When the fire occurred. I was fast______(sleep) 7. Mr. Robinson is a _______.He presents weather reports on TV every night(weather) 8. I can never make up stories - I have absolutely no_____(image) 9.________waves are one of the great forces of nature They can be very dangerous to people.(tide) 10. Tsunamis, earthquakes and typhoons are ____disasters(nature) 11. A typhoon is going to hit our area. What sorts of _________ shall we make?(prepare ) 12 Canned food is very convenient for campers.(can 13. Today _____ can predict when a tidal w will hit land. (science) 14. The________of 4 million unemployed now looks horrifyingly realis (predict) 15.A legal fight has_____between two of the world's larget oil companies (eruption) 16.With dramatic ______,a decision was taken to close the school for good (abrupt) 17.Geologist understand many of the factors that cause_____eruptions (volcano)

1
27 tháng 3 2022

Word forms.

1. This stick is used for____measuring_____the amount of oil in the engine- do you see the marks on it? (measurement)

2. Such a war would be___disastrous____for the country (disaster)

3. Among the undergraduates____ tornados _______ or strong winds (ranked 45th scored by 15% of sample) and earthquakes (48th; 12%) are rarely dreamed about (tornado)

4. It was a frightening sight for Pliny to see the volcanic__eruption___of Mr. Vesuvius (erupt)

5. The mountain was full of__volcanic__rock and ash when the eruption was over (volcano)

6. When the fire occurred. I was fast__asleep____(sleep)

7. Mr. Robinson is a _weatherman__. He presents weather reports on TV every night (weather)

8. I can never make up stories - I have absolutely no_immagination___(image) 9.___Tidal_____waves are one of the great forces of nature They can be very dangerous to people.(tide)

10. Tsunamis, earthquakes and typhoons are _natural___disasters (nature)

11. A typhoon is going to hit our area. What sorts of _preparation___ shall we make? (prepare )

12 Canned food is very convenient for campers. (can)  ********No good******

13. Today __scientist___ can predict when a tidal will hit land. (science)

14. The__prediction______of 4 million unemployed now looks horrifyingly realistic (predict)

15.A legal fight has__erupted___between two of the world's largest oil companies (eruption)

16.With dramatic _eruption___, a decision was taken to close the school for good (abrupt)

17.Geologist understand many of the factors that cause__vocanic__eruptions (volcano)

27 tháng 3 2022

Correction:

13 - scientists

21 tháng 6 2019

1.we should try to save money, or we will be.....in debt....... some day (debt)

2.He.....threatened.......to kill the boy if the police were informed of the kidnapping. (threat)

3. My....personal... opinion is that students should do more work outside the classroom.( person)

4.One of the.....strength......of English is that is becoming simpler and simpler.(strong)

5. Such a war would be......disaster.......for the country. (disaster)

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 from 43 to 50.          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since 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 from 43 to 50.

          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.

          Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old. 

          Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has.

The word “it” in paragraph 1 refers to______.

A. carbon dating

B. the age

C. any organic natural material

D. archeology

1
25 tháng 11 2018

Đáp án A

Từ “it” ở đoạn 1 ám chỉ tới ______.

A. phương pháp xác định niên đại bằng carbon. 

B. tuổi. 

C. bất kỳ chất hữu cơ tự nhiên. 

D. khảo cổ học. 

“it” đứng đầu câu làm chủ ngữ nên ta đọc lên cả câu phía trên. 

Tạm dịch: “Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields” – (Phương pháp xác định niên đại bằng carbon có thể được sử dụng để ước lượng tuổi của bất kì chất hữu cơ tự nhiên nào, nó được sử dụng thành công trong lĩnh vực khảo cổ học để xác định tuổi của các cổ vật, hóa thạch cổ cũng như là trong nhiều lĩnh vực khác). 

=> Dựa và ngữ cảnh của câu thì “it” chỉ có thể là ám chỉ cho “Carbon dating”.

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 from 13 to 50.           Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since 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 from 13 to 50.

          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.
          Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old.
          Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has

The word “it” in paragraph 1 refers to______. 

A. carbon dating

B. the age

C. any organic natural material 

D. archeology 

1
4 tháng 7 2019

Đáp án A

Từ “it” ở đoạn 1 ám chỉ tới ______.

A. phương pháp xác định niên đại bằng carbon.

B. tuổi.

C. bất kỳ chất hữu cơ tự nhiên.

D. khảo cổ học.

“it” đứng đầu câu làm chủ ngữ nên ta đọc lên cả câu phía trên.

Tạm dịch: “Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields” – (Phương pháp xác định niên đại bằng carbon có thể được sử dụng để ước lượng tuổi của bất kì chất hữu cơ tự nhiên nào, nó được sử dụng thành công trong lĩnh vực khảo cổ học để xác định tuổi của các cổ vật, hóa thạch cổ cũng như là trong nhiều lĩnh vực khác).

=> Dựa và ngữ cảnh của câu thì “it” chỉ có thể là ám chỉ cho “Carbon dating”.

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 from 13 to 50.           Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since 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 from 13 to 50.

          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.
          Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old.
          Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has

This passage is mainly about______. 

A. archeology and the study of ancient artifacts

B. one method of dating old objects

C. various uses for carbon. 

D. the differences between carbon-14 and nitrogen-14

1
24 tháng 9 2017

Đáp án B

Đoạn văn chủ yếu bàn về______.

A. khảo cổ học và sự nghiên cứu các hiện vật cổ.

B. một phương pháp xác định niên đại các cổ vật.

C. các ứng dụng khác nhau cho cacbon.

D. sự khác biệt giữa cacbon-14 và nitơ-14.

Câu đầu tiên chính là câu giới thiệu chủ đề của bài: “Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields” – (Phương pháp xác định niên đại bằng carbon có thể được sử dụng để ước lượng tuổi của bất kì chất hữu cơ tự nhiên nào, nó được sử dụng thành công trong lĩnh vực khảo cổ học để xác định tuổi của các cổ vật, hóa thạch cổ cũng như là trong nhiều lĩnh vực khác).

=> Đoạn văn nói về phương pháp xác định niên đại bằng carbon

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 from 43 to 50.          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since 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 from 43 to 50.

         Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.

        Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old.

        Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the miniscule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has.

This passage is mainly about ______.

A. archeology and the study of ancient artifacts

B. one method of dating old objects

C. various uses for carbon

D. the differences between carbon-14 and nitrogen-14

1
28 tháng 10 2018

Đáp án B.

Đoạn văn chủ yếu bàn về

A. khảo c học và sự nghiên cứu các hiện vật c.

B. một phương pháp xác định niên đại các cổ vật.

C. các ứng dụng khác nhau cho cacbon.

D. sự khác biệt giữa cacbon-14 và nitơ-14.

Câu đầu tiên chính là câu giới thiệu chủ đ của bài: “Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields“: Phương pháp xác định niên đại bằng carbon có th được sử dụng đ ước lượng tui của bất kì chất hữu cơ tự nhiên nào, nó được sử dụng thành công trong lĩnh vực khảo c học đ xác định tui của các c vật, hóa thạch c cũng như là trong nhiu lĩnh vưc khác.

Đoạn văn nói v phương pháp xác định niên đại bằng carbon.

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 from 43 to 50.          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since 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 from 43 to 50.

          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.

          Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old. 

          Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has.

This passage is mainly about______.

A. archeology and the study of ancient artifacts

B. one method of dating old objects

C. various uses for carbon

D. the differences between carbon-14 and nitrogen-14

1
5 tháng 10 2017

Đáp án B

Đoạn văn chủ yếu bàn về______.

A. khảo cổ học và sự nghiên cứu các hiện vật cổ. 

B. một phương pháp xác định niên đại các cổ vật. 

C. các ứng dụng khác nhau cho cacbon. 

D. sự khác biệt giữa cacbon-14 và nitơ-14. 

Câu đầu tiên chính là câu giới thiệu chủ đề của bài: “Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields” – (Phương pháp xác định niên đại bằng carbon có thể được sử dụng để ước lượng tuổi của bất kì chất hữu cơ tự nhiên nào, nó được sử dụng thành công trong lĩnh vực khảo cổ học để xác định tuổi của các cổ vật, hóa thạch cổ cũng như là trong nhiều lĩnh vực khác). 

=> Đoạn văn nói về phương pháp xác định niên đại bằng carbon.

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 from 13 to 50.           Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since 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 from 13 to 50.

          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.
          Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old.
          Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has

It is implied in the passage that______. 

A. carbon dating has no known uses outside of archeology.

B. fossils cannot be age-dated using carbon-14

C. carbon dating could not be used on an item containing nitrogen

D. carbon-14 does not have the longest known half-life

1
24 tháng 10 2018

Đáp án D

Đoạn văn ngụ ý rằng______.

A. phương pháp xác định niên đại bằng các-bon không được biết đến ngoài nghành khảo cổ học.

B. hóa thạch không thể xác định được niên đại bằng cách sử dụng carbon-14.

C. phương pháp xác định niên đại bằng các-bon không thể sử dụng trên vật có chứa ni-tơ.

D. carbon-14 không có chu kỳ bán rã dài nhất được biết đến.

Từ câu 48 ta suy ra vẫn còn có chất khác có chu kì bán rã dài hơn carbon-14 để xác định được niên đại của những cổ vật trên 80,000 tuổi

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 from 43 to 50.          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since 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 from 43 to 50.

          Carbon dating can be used to estimate the age of any organic natural material; it has been used successfully in archeology to determine the age of ancient artifacts or fossils as well as in a variety of other fields. The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth. Since a radioactive substance such as carbon-14 has a known half-life, the amount of carbon-14 remaining in an object can be used to date that object.

          Carbon-14 has a half-life of 5,570 years, which means that after that number of years, half of the carbon- 14 atoms have decayed into nitrogen-14. It is the ratio of carbon-14 in that substance that indicates the age of the substance. If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, this indicates that around half of the carbon-14 has decayed into nitrogen-14, and the sample is approximately 5,570 years old. 

          Carbon dating cannot be used effectively in dating objects that are older than 80,000 years. When objects are that old, much of the carbon-14 has already decayed into nitrogen-14, and the molecule amount that is left doesn’t provide a reliable measurement of age. In the case of older objects, other age-dating methods are available, methods which use radioactive atoms with longer half-lives than carbon has.

It is implied in the passage that______.

A. carbon dating has no known uses outside of archeology

B. fossils cannot be age-dated using carbon-14

C. carbon dating could not be used on an item containing nitrogen

D. carbon-14 does not have the longest known half-life

1
6 tháng 11 2019

Đáp án D

Đoạn văn ngụ ý rằng______.

A. phương pháp xác định niên đại bằng các-bon không được biết đến ngoài nghành khảo cổ học. 

B. hóa thạch không thể xác định được niên đại bằng cách sử dụng carbon-14. 

C. phương pháp xác định niên đại bằng các-bon không thể sử dụng trên vật có chứa ni-tơ. 

D. carbon-14 không có chu kỳ bán rã dài nhất được biết đến. 

Từ câu 48 ta suy ra vẫn còn có chất khác có chu kì bán rã dài hơn carbon-14 để xác định được niên đại của những cổ vật trên 80,000 tuổi.