单词拼写。

1. It's important for us to ________ (体验) nature.

2. Their travel ________ (目的地) is the seaside.

3. Let's ________ (合并) learning with relaxation.

4. We'll go on our ________ (各自的) holidays.

5. You must pay attention to your ________ (安全) when crossing the road.

6. Our city was struck by the heavy flood. With the help of the government,

    everything returned to n________ quickly.

7. Some people travel for learning, and (while) others travel for p________.

8. Rafting is more a________ than hiking.

9. We should protect the e________ and love nature.

10. Have you c________ making friends with Tom?

关于觉醒与睡眠的转换，哪项是不确切的

A．在觉醒状态下，一般只能进入慢波睡眠
B．觉醒状态绝对不能直接进入异相睡眠
C．慢波睡眠可直接转为觉醒
D．异相睡眠也能直接转为觉醒