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

试卷相关题目

• 1Radar is used to determine the characteristics of radiocarbon.

  A.Right

  B.Wrong

  C.Not mentioned

  开始考试点击查看答案
• 2An atom of ordinary carbon has six protons and eight neutrons

  A.Right

  B.Wrong

  C.Not mentioned

  开始考试点击查看答案
• 3The radiocarbon dating technique is only about 40 years old

  A.Right

  B.Wrong

  C.Not mentioned

  开始考试点击查看答案
• 4Nowadays many scientists depend on radiocarbon for dating age-old objects

  A.Right

  B.Wrong

  C.Not mentioned

  开始考试点击查看答案
• 5There is always excitement at the Olympic Games when an athlete __breaks__ a record

  A.beats

  B.maintains

  C.matches

  D.tries

  开始考试点击查看答案
• 6When an organism dies， the C-14 in it begins to decay.

  A.Right

  B.Wrong

  C.Not mentioned

  开始考试点击查看答案
• 7The half-life of C-14 is about 25，000 years.

  A.Right

  B.Wrong

  C.Not mentioned

  开始考试点击查看答案
• 8On a clear night， people can see

  A.150 stars.

  B.hundreds of stars.

  C.one thousand stars.

  D.more than 14，000 stars.

  开始考试点击查看答案
• 9Light pollution occurs when

  A.artificial lights illuminate the night sky.

  B.the moon lights up the night sky.

  C.too many stars are visible in the night sky

  D.streetlights are turned off.

  开始考试点击查看答案
• 10Nowadays even suburbs are becoming unsuitable for scientists to do their jobs because

  A.the night sky there is too dark.

  B.the once dark areas are also polluted by lights.

  C.these areas are not polluted by chemicals.

  D.these areas are less developed.

  开始考试点击查看答案