Câu hỏi:

24/03/2020 1,670

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.

The paragraph following the passage most probably discusses_____.

A. what substances are part of all living things

B. how carbon-14 decay intonitrogen-14

C. why carbon-14 has such a long half-life

D. various other age-dating methods

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 D.

Đoạn văn tiếp theo của đoạn trong bài có thế bản về_______.

A. những chất nào là một phần của tất cả sự sống.

B. làm thế nào cacbon-14 phân hủy thành nitơ-14.

C. tại sao cacbon-14 lại có thời gian bán hủy dài như vậy.

D. các phương pháp xác định niên đại khác.

Đoạn văn nối tiếp theo sau sẽ có nội dung liên quan và nối tiếp với đoạn cuối cùng của bài.

Tạm dịch đoạn cuối: “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”: Phương pháp xác định niên đại bằng carbon không thể được sử dụng có hiệu quả đối với cổ vật trên 80,000 tuổi. Đối với những cổ vật có tuổi đời như vậy, phần lớn carbon-14 đã hoàn toàn phân hủy thành nitơ-14, và lượng phân tử còn lại không đáng tin cậy để đo lường được độ tuổi. Trong trường hợp đối với những cổ vật có niên đại lâu hơn, những phương pháp xác định niên đại khác mới khả dụng, những phương pháp sử dụng các nguyên tử phóng xạ có thời gian bán hủy lâu hơn carbon. Đối với những cổ vật có tuổi đời lâu hơn 80 000 tuổi phương pháp xác định niên đại bằng carbon không còn khả dụng, cần đến những phương pháp khác.

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 45,416

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 36,179

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: “______”