硫化氢中毒的机制是（）。

A.该气体与细胞色素氧化酶中三价铁和谷胱苷肽结合，抑制细胞呼吸酶

B.该气体与氧化型细胞色素氧化酶中的二价铁结合，引起细胞内窒息

C.使血氧饱和度增加，组织不能利用氧

D.引起氧分压增加，导致组织供氧不足，引起缺氧

E.影响血液中氧的释放和传递，导致低氧血症和组织缺氧

用所给单词的正确形式填空。

1. Last football match was very ______ (excite).

2. ______ (stay) up late is bad for your health.

3. Why don't you ______ (give) up smoking?

4. My parents didn't feel ______ (good) last Sunday.

5. ______ (not walk) on the lawn. We must protect (保护) our environment.