城市规划管理系统的构成要素包括()。A．管理目标、管理人员、被管理者、管理对象、管理

每年6月5日是“世界环境保护日”．以下哪种行为不利于保护环境（　　）

A．同学、朋友间发电子贺卡代替赠纸质贺卡

B．2008年6月1日起，实行塑料购物袋有偿使用制度，以减少“白色污染”

C．某些书店悬挂宣传标语，引导读者使用环保书袋

D．某些同学将废旧电池随地乱扔

下面四幅图，能正确表示渔民在岸边看到水中的鱼的光路图是（　　）

A．

B．

C．

D．

Although you have learned much knowledge and a lot of theories, the problem is _______ can be put into practice.

A．what you have learned

B．how what you have learned

C．that what you have learned

D．how that you have learned

用所给词的适当形式填空。

1. Let me ________ ( help) her with her English.

2. ________ ( take) a bus from Sixth. Avenue and go down Bridge Street.

3. The Summer Palace is a good place ________ ( have) fun in Beijing.

4.  Children often enjoy ________ ( play ) computer games.

5. I know you ________ ( arrive) next Sunday.

6. Look at the photo. The ________ ( five) man on the left is our PE teacher.

7. A good ________ (begin)makes a good ending.

8. Do you enjoy ________ ( you) in the park every week?

9. Be careful (当心) when  you ________ ( across) the street.

10. Every year many ________ ( visit) come to visit the Great Wall.

什么是无风险利率？