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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 44 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.
Câu hỏi: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
Lời giải tham khảo:
Đáp án đúng: B
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“.
Dịch: 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.
Câu hỏi này thuộc đề thi trắc nghiệm dưới đây, bấm vào Bắt đầu thi để làm toàn bài
Hướng dẫn Trắc nghiệm Online và Tích lũy điểm thưởng
CÂU HỎI KHÁC
- Mr. Lam is a cycle driver in Ho Chi Minh City, who usually has a ________ working day.
- You could not give me a helping hand, _____?
- The employees have been working ______ out to get the job finished ahead of the deadline.
- If you get a laptop as a reward, what will you use it ____?
- The bank will insist you produce a driving ________ or passport as a form of ID
- ____ the TRUMPET is the smallest brass instrument, it can play the highest notes of all the brass instruments and often plays in marches or fanfares.
- His sister is not only a (n) ______________ singer but also a distinguished painter.
- Mark invented a new game, but it never really __________ with people.
- He fell down when he______towards the pagoda.
- She will apply for a job _______.
- It ______ without saying that Mrs Ngoc Anh is a very enthusiastic teacher. I love her so much.
- As soon as Ferlin came to party, he immediately set his _______on Melin. Maybe he was captivated by her.
- English ___________ in many countries
- ___________ all the lights and other electric devices, we left the classroom.
- ___________ you study for these exams, the better you will do.
- Ben: You didn’t go to school yesterday, did you?”
- Mother: How come you didn’t tell me that you would quit your job?
- Choose the word that differs from the other three in the position of primary stress: attitude, manager, invention, company
- Choose the word that differs from the other three in the position of primary stress: carry, remove, protect, consist
- Choose the word whose underlined part differs from the other three in pronunciation: finished, developed, defeated, looked
- Choose the word whose underlined part differs from the other three in pronunciation: sale, chalk, date, plane
- Choose the word(s) CLOSEST in meaning to the underlined word(s): In the 1980s TV viewers began to hook up videocassette players to thei
- Choose the word(s) CLOSEST in meaning to the underlined word(s): The police have not had time to complete their investigations, but they have con
- Choose the word(s) OPPOSITE in meaning to the underlined word(s): Humans can use language deceptively by telling lies or half-truths.
- Choose the word(s) OPPOSITE in meaning to the underlined word(s): Tired of being a tiny cog in a vast machine, he handed in his resignation.
- The only way to eliminate world terrorism is by united opposition.
- Collin is not very good at English. He failed the English exam last week.
- Find the mistake: Papyrus was usedful for making not only paper but also sails, baskets, and clothing.
- Find the mistake: Because the boy spent too much time surfing the Internet and playing computer games, she did
- Find the mistake: According to most medical experts, massage relieves pain and anxiety, eases depression and speeding up
- It was impossible that she forgot to wear the helmet.
- Cindy said: I haven’t seen John since last month.”
- He last visited London 3 years ago.
- (34) _________, scientists cannot yet predict how many deaths may result.
- The Wuhan coronavirus spreading from China is now likely to become a pandemic (35) _________ circles the globe
- (36) _________ countries, including the United States.
- Scientists do not yet know how (37) _________ the new coronavirus is, however, so there is uncertainty about how much damage a pandemic might cause.
- Many scientists have found that the Wuhan coronavirus is spreading more like influenza, which is highly (38) _________ than its slow-moving viral cousins, SARS and MERS.
- What is the passage mainly about? (Martin Luthur King)
- When was M.L. bom?
- What's Martin Luthur King well- known for?
- According to the author of the passage, M.L. __________
- Which of the statements is NOT true?
- This passage is mainly about _____.
- Which of the following is NOT true about carbon-14?
- The word it” in paragraph I refers to _________.
- The word underlying” in paragraph I could best be replaced by __________.
- This paragraph following the passage most probably discusses _________.
- It is implied in the passage that ____________.
- It can be inferred from the passage that if an item contains more carbon-14 than nitrogen- 14, then the item is _____________.
