根据句意、首字母提示或汉语写出合适的单词。

1. —What’s your home a_____________?

— It’s No.8 Jiaotong Road, Jinsha Town.

2. It’s very important for us to be careful when we are walking a__________  the road.

3. Our government has done something to r       “white pollution”.

4. My brother often failed in Chinese exams in the            (过去).

5. Visiting Shanghai World Expo, we can learn a lot of ______________(知识) about other countries.

6. Today more and more people realize the ______________ (重要性) of health.

7. In the past few years, the city has developed at very high ___________(速度).

某船在顶流中掉头，流速为1米/秒，掉头所需时间为5分钟，其漂移距离约为：（）

A.420米

B.240米

C.180米

D.360米