根据句意及首字母补全在本课中出现的单词。

1. E_____ in our class can help each other.

2. In the early morning,the air is very f_____ .

3. It's a h_____ store,We can't move it.

4. We should o_____ a club to collect the paper.

5. Please b_____ your stamp collection to school.

绞窄性肠梗阻易产生的酸碱失衡类型是（）

A.呼吸性酸中毒

B.呼吸性碱中毒

C.代谢性酸中毒

D.代谢性碱中毒

E.呼吸性酸中毒＋代谢性碱中毒