单选题
The mice in northern Europe move when ______.
A、
they give birth
B、
the weather is bad
C、
the place gets too crowded
D、
they haven't enough food
【正确答案】
C
【答案解析】
[分析] 关键信息为They leave their mountain homes when they become too crowded．故选C。
提交答案
关闭