2. 外语
  3. A new study on birds’ sleep has revealed that ______. The example of a bird sleeping in front of a mirror indicates that ______

A new study on birds’ sleep has revealed that ______. The example of a bird sleeping in front of a mirror indicates that ______

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问题 A new study on birds’ sleep has revealed that ______.
The example of a bird sleeping in front of a mirror indicates that ______.
选项 A、the phenomenon of birds dozing in pairs is widespread
B、birds prefer to sleep in pairs for the sake of security
C、even an imagined companion gives the bird a sense of security
D、a single pet bird enjoys seeing its own reflection in the mirror
答案C
解析 第六段后两句，即鸟在镜子前睡觉的例子是对本段前两句的进一步佐证。The preference for opening an eye on the lookout side...是为了对敌人的进攻保持警觉，而The mirror-side eye closed是因为as if the reflection were a companion(好象镜中的影像是它的同伴一样)。
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