Câu hỏi:

24/03/2020 643

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

Xem lời giải

Câu hỏi trong đề: Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết !!

Bắt đầu thi

Trả lời:

Giải bởi Vietjack

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 vưc khác.

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

Bình luận

Câu 1:

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

She tried very hard to pass the driving test. She could hardly pass it.

A. Although she didn’t try hard to pass the driving test, she could pass it.

B. Despite being able to pass the driving test, she didn’t pass it.

C. No matter how hard she tried, she could hardly pass the driving test.

D. She tried very hard, so she passed the driving test satisfactorily.

Xem đáp án » 24/03/2020 76,187

Câu 2:

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

Students are_______less pressure as a result of changes in testing procedures.

A. under

B. above

C. upon

D. out of

Xem đáp án » 23/03/2020 56,899

Câu 3:

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

Sorry for being late. I was_________in the traffic for more than an hour.

A. carried on

B. held up

C. put off

D. taken after

Xem đáp án » 24/03/2020 52,711

Câu 4:

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

For such (A) a demanding job, you will need qualifications,(B) soft skills and having full (C)

commitment.(D)

A. such

B. will need qualifications

C. having full

D. commitment

Xem đáp án » 23/03/2020 45,417

Câu 5:

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.

Drivers are advised to get enough petrol because filling stations are few and far between on the highway.

A. easy to find

B. difficult to access

C. unlikely to happen

D. impossible to reach

Xem đáp án » 24/03/2020 36,180

Câu 6:

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions

Tom is getting ever keener on doing research on_______.

A. biology

B. biological

C. biologist

D. biologically

Xem đáp án » 23/03/2020 34,389

Câu 7:

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

Mary is talking to a porter in the hotel lobby.

Porter: “Shall I help you with your suitcase?”

Mary: “______”

A. Not a chance.

B. That’s very kind of you.

C. I can‘t agree more.

D. What a pity!

Xem đáp án » 24/03/2020 25,503

Bình luận

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

She tried very hard to pass the driving test. She could hardly pass it.

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

Students are_______less pressure as a result of changes in testing procedures.

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

Sorry for being late. I was_________in the traffic for more than an hour.

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

For such (A) a demanding job, you will need qualifications,(B) soft skills and having full (C)

commitment.(D)

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.

Drivers are advised to get enough petrol because filling stations are few and far between on the highway.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions

Tom is getting ever keener on doing research on_______.

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

Mary is talking to a porter in the hotel lobby.

Porter: “Shall I help you with your suitcase?”

Mary: “______”

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🔥 Đề thi HOT:

Bình luận

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions. She tried very hard to pass the driving test. She could hardly pass it.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Students are_______less pressure as a result of changes in testing procedures.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Sorry for being late. I was_________in the traffic for more than an hour.

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. For such (A) a demanding job, you will need qualifications,(B) soft skills and having full (C) commitment.(D)

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions. Drivers are advised to get enough petrol because filling stations are few and far between on the highway.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions Tom is getting ever keener on doing research on_______.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. Mary is talking to a porter in the hotel lobby. Porter: “Shall I help you with your suitcase?” Mary: “______”

VIP +1 tháng ( 199,000 VNĐ )

VIP +3 tháng ( 299,000 VNĐ )

VIP +6 tháng ( 399,000 VNĐ )

VIP +12 tháng ( 499,000 VNĐ )

🔥 Đề thi HOT:

CHỌN BỘ SÁCH BẠN MUỐN XEM

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Quên mật khẩu

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

She tried very hard to pass the driving test. She could hardly pass it.

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

Students are_______less pressure as a result of changes in testing procedures.

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

Sorry for being late. I was_________in the traffic for more than an hour.

Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.

For such (A) a demanding job, you will need qualifications,(B) soft skills and having full (C)

commitment.(D)

Mark the letter A, B, C, or D on your answer sheet to indicate the word(s) OPPOSITE in meaning to the underlined word(s) in each of the following questions.

Drivers are advised to get enough petrol because filling stations are few and far between on the highway.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions

Tom is getting ever keener on doing research on_______.

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

Mary is talking to a porter in the hotel lobby.

Porter: “Shall I help you with your suitcase?”

Mary: “______”