2. 外语
  3. Experiments in which animals live in artificial surroundings show that ______. What determines whether an animal is sleeping or

Experiments in which animals live in artificial surroundings show that ______. What determines whether an animal is sleeping or

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问题 Experiments in which animals live in artificial surroundings show that ______.
What determines whether an animal is sleeping or just resting?
选项
答案The complexity of its nervous system.
解析 由题干whether可定位至第三段首句Whether the resting state…depends on the complexity of its nervous system，由此可知答案。
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大学英语四级

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