The radiocarbon dating technique is only about 40 years old

试卷相关题目

• 1Nowadays many scientists depend on radiocarbon for dating age-old objects

  A.Right

  B.Wrong

  C.Not mentioned

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• 2There is always excitement at the Olympic Games when an athlete __breaks__ a record

  A.beats

  B.maintains

  C.matches

  D.tries

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• 3Obviously these people can be __relied on__ in a crisis.

  A.lived on

  B.depended on

  C.believed in

  D.joined in

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• 4The chairman __proposed__ that we stop the meeting.

  A.stated

  B.announced

  C.demanded

  D.suggested

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• 5We had a long __conversation__ about her parents

  A.speech

  B.question

  C.talk

  D.debate

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• 6An atom of ordinary carbon has six protons and eight neutrons

  A.Right

  B.Wrong

  C.Not mentioned

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• 7Radar is used to determine the characteristics of radiocarbon.

  A.Right

  B.Wrong

  C.Not mentioned

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• 8Radiocarbon is reliable in dating an object back to at least 50，000 years.

  A.Right

  B.Wrong

  C.Not mentioned

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• 9When an organism dies， the C-14 in it begins to decay.

  A.Right

  B.Wrong

  C.Not mentioned

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• 10The half-life of C-14 is about 25，000 years.

  A.Right

  B.Wrong

  C.Not mentioned

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