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In line 21, the word “keepers” refers to ______.

  • A.persons who look after animals in a gigantic zoo
  • B.astronauts travelling in the manned space ship
  • C.persons who are observing us
  • D.intelligent beings observing us from outer space
试题出自试卷《2012年1月全国自主考试综合英语(一)真题及答案》
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