Câu hỏi:
03/04/2020 578Read 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 “roughly” in paragraph 2 is closest in meaning to______.
Đáp án chính xác
Câu hỏi trong đề:
20 Đề ôn thi Tiếng Anh chuẩn cấu trúc 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
Câu hỏi từ vựng.
Roughly (adv) = C. approximately (adv): xấp xỉ, khoảng chừng.
Các đáp án còn lại:
A. precisely (adv): chính xác.
B. harshly (adv): khắc nghiệt.
D. coarsely (adv): thô, không đúng cách.
Tạm dịch: “If, for example, in a particular sample the amount of carbon-14 is roughly equivalent to the amount of nitrogen-14, […]”- (Thí dụ như, nếu trong một mẫu vật cụ thể lượng cacbon-14 tương đương với lượng nitơ-14, […]).
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 underlined part that needs correction in each of the following questions
Drying food by means of solar energy is an ancient process applying wherever climatic conditions make it possible
Xem đáp án »
03/04/2020
36,226
Câu 2:
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
Although she was very old, she looked very grateful
Xem đáp án »
03/04/2020
24,251
Câu 3:
He may be quick ______ understanding but he isn't capable ______ remembering anything
Xem đáp án »
03/04/2020
24,031
Câu 4:
Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.
“Why don’t you ask your parents for advice?” said Tom
Xem đáp án »
03/04/2020
20,469
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.
I am glad that we see eye to eye on the matter of the conference location.
Xem đáp án »
03/04/2020
14,820
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.
I regret going to the cinema. I wish I ______.
Xem đáp án »
03/04/2020
13,858
Câu 7:
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
Sports clear my mind. They also help me maintain a healthy lifestyle
Xem đáp án »
03/04/2020
12,378
Bình luận
🔥 Đề thi HOT:
-
30 đề thi THPT Quốc gia môn Tiếng Anh năm 2022 có lời giải (Đề 1)
-
20 Đề thi thử THPTQG môn Tiếng Anh cực hay có đáp án (Đề số 1)
-
30 đề thi thử đề thi thử THPTQG môn Tiếng Anh có lời giải chi tiết (Đề số 1)
-
30 đề luyện thi Đại Học môn Tiếng Anh cực hay có lời giải (Đề số 1)
-
Tuyển tập đề thi thử Tiếng Anh cực hay có lời giải (Đề số 1)
-
Tổng hợp đề thi thử tiếng anh thpt quốc gia (Đề số 1)
-
20 BỘ ĐỀ THI THỬ THPT QUỐC GIA LẦN 1 NĂM HỌC 2018 - 2019 MÔN: TIẾNG ANH(ĐỀ 16)
-
Tổng hợp đề thi thử THPTQG môn Tiếng Anh có đáp án (Đề số 1)
về câu hỏi!