Most animals move from one place to another at a certain time to ______. The mice in northern Europe move when ______.

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问题 Most animals move from one place to another at a certain time to ______.
The mice in northern Europe move when ______.

选项 A、they give birth
B、the weather is bad
C、the place gets too crowded
D、they haven’t enough food

答案C

解析 关键信息为They leave their mountain homes when they become too crowded.故选C。
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