2. 外语
  3. Experiments in which animals live in artificial surroundings show that ______. Animals try to avoid their enemies by ______.

Experiments in which animals live in artificial surroundings show that ______. Animals try to avoid their enemies by ______.

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问题 Experiments in which animals live in artificial surroundings show that ______.
Animals try to avoid their enemies by ______.
选项
答案reducing activity at certain times
解析 由题干enemies可定位至第二段第三句…they make the animal less conspicuous to its enemies(它们使得动物对其天敌来说不太显眼)，其中they指的是该段开头提到的daily periods of reduced activity，即休息时间。
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大学英语四级

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