【明報專訊】Across

1. When it is very cold, bears, chipmunks (花栗鼠) and hedgehogs (刺蝟) hibernate to keep _ _ _ _ _ _ in their bodies.

4. Animals that hibernate survive winter by going into a state like deep _ _ _ _ _.

5. The bat is the only mammal that flies. When bats hibernate, their breath _ _ _ _ may slow down to just one breath an hour.

Down

2. Animals may hibernate six months or more! Nonetheless, some of them "wake up" _ _ _ _ _ _ _ _ _ to eat.

3. A hibernating animal's heart usually _ _ _ _ _ only a few times a minute.

(Answers on next text)

■ Glossary

hibernate (v) 冬眠

survive (v) 存活