如果干扰源的频率为1982MHz，系统间的空间隔离度要求为40dB，则采用水平空间隔离时的距离为（）米（不考虑天线增益）。

A、1

B、1.2

C、1.5

D、2

用括号中的动词适当形式填空。

1. We are so glad ________ (hear) the news.

2. I saw him ________ (cross) the road safely and ________ (run) away.

3. You can't make him ________ (do) what you want.

4. I don't know where ________ (meet) him.

5. What makes you ________ (think) I'm a farmer?

6. Did you see him ________ (go) upstairs?

7. It is better ________ (put) your money in a bank.

8. It is difficult for the boy ________ (swim) across the river.