2. 外语
  3. A new study on birds’ sleep has revealed that ______. According to the passage, birds often half sleep because ______.

A new study on birds’ sleep has revealed that ______. According to the passage, birds often half sleep because ______.

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问题 A new study on birds’ sleep has revealed that ______.
According to the passage, birds often half sleep because ______.
选项 A、they have to watch out for possible attacks
B、their brain hemispheres take turns to rest
C、the two halves of their brain are differently structured
D、they have to constantly keep an eye on their companions
答案A
解析 相关句子在文章第六段第一句，"这些结论为证实一项长久以来人们的设想—半睡眠是动物为防范敌人进化而来的—提供了最好的证据"。原文中的scan与答案选项中的watch out相对应。
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