下列有关食物链和食物网的叙述，正确的是（） A.食物网由许多相

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问题单项选择题

下列有关食物链和食物网的叙述，正确的是（）

A.食物网由许多相互独立的食物链构成

B.在捕食食物链中，各营养级获得能量的方式基本相同

C.食物网越复杂，生态系统受到干扰时恢复原状的能力越强

D.在食物网中，一种生物可能属于不同的营养级

答案

参考答案：D

单项选择题 A1型题

氟污染的危害不包括（）。

A.氟斑牙

B.氟骨症

C.青春期发育延迟

D.影响骨骼正常生长

E.智力低下

填空题

A. 根据所给汉语，写出句中所缺的词语。

1. You could (自愿服务)in a hospital.

2. I'd like to help (无家可归)people.

3. We often visit (小学的，初级的)schools and help the teachers.

4. A girl won a million dollars in the (抽奖).

5. Before you borrow something from a friend, you'd better ask his or her 　　 (许可)

B. 根据句意填空。

1. Whose is that book? It be Liu Mei's.

2. I don't like art at all. But my sister art to music.

3. are from Italy. They like to eat pizza.

4. He can't walk and he sits in a .

5. It's easy to be angry but it's hard to .