小测验：选择正确的单词

1. Squirrels and hedgehogs hibernate.
   松鼠和猬是冬眠动物。
2. Frogs hibernate during the winter every year.
   每年冬天青蛙都会冬眠。
3. Some warm-blooded animals do not need to hibernate.
   一些温血动物不需要冬眠。
4. In the cold weather some of them hibernate.
   它们有的在严寒的天气冬眠了。
5. In winter bears usually hibernate in their dens.
   冬天熊通常在穴里冬眠。

　2个动词解释