绿色植物是生物圈中最基本和最重要的生物成分，下列关于它的作用叙述正确的是（　　）

A．绿色植物是生物圈中的生产者

B．绿色植物能通过呼吸作用促进生物圈的水循环

C．绿色植物能通过光合作用维持大气中二氧化碳和氧气的平衡

D．绿色植物能通过蒸腾作用维持大气中二氧化碳和氧气的平衡

用所给词的适当形式填空。

1. His sister is a good ________ (dance).

2. Please pass ________ (I) some salt.

3. He is ________ (run) in the playground.

4. It's important to be ________ (health).

5. I like eating ________ (dry) fish very much.

6. My father ________ (mend) a clock now.

7. Some boys ________ (lie) on the beach(海滩).

8. I _______ (chat) with my friend on the Internet now.

9. My father often ________ (watch) TV after supper.

10. ________ (not open) the door. It's too cold outside.