Câu hỏi:
24/03/2020 828Read 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 word “underlying” in paragraph I could best be replaced by _______.
Đáp án chính xác
Câu hỏi trong đề:
Bộ đề thi thử 2019 Tiếng Anh cực hay có lời giải chi tiết !!
Sách mới 2k7: Tổng ôn Toán, Lí, Hóa, Văn, Sử, Địa…. kỳ thi tốt nghiệp THPT Quốc gia 2025, đánh giá năng lực (chỉ từ 110k).
Quảng cáo
Trả lời:
Giải bởi Vietjack
Đáp án C.
- underlying (adj): cơ bản, cơ sở = C. serving as a basis for: làm cơ sở cho.
Các đáp án còn lại:
A. bên dưới.
B. yêu cầu.
D. đang được nghiên cứu qua.
Tạm dịch: “The principle underlying the use of carbon dating is that carbon is a part of all living things on Earth": Nguyên tắc làm cơ sở tiền đề cho việc sử dụng phương pháp xác định niên đại bằng carbon đó là carbon là một phần của tất cả các sinh vật sống trên trái đất.
Nhà sách VIETJACK:
CÂU HỎI HOT CÙNG CHỦ ĐỀ
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.
Xem đáp án »
24/03/2020
73,520
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.
Xem đáp án »
23/03/2020
55,860
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.
Xem đáp án »
24/03/2020
48,938
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)
Xem đáp án »
23/03/2020
43,949
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.
Xem đáp án »
24/03/2020
35,413
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_______.
Xem đáp án »
23/03/2020
32,706
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: “______”
Xem đáp án »
24/03/2020
24,963
về câu hỏi!