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The birds mentioned in the third paragraph fly north in midwinter because__________ .

  • A.they are specially trained by a scientist
  • B.they are affected by seasorfal changes
  • C.there is a change in their body temperature
  • D.they are exposed to extra daylight
试题出自试卷《2014年成人高考学士学位英语考试考前预测试卷(4)》
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