根据所给词的适当形式填空。

1. Zhou Jielun is his favorite _____ (sing).

2. My parents give a pair of _____ (train) to me as my birthday present.

3. People in China have different _____ (habit) from people in the USA.

4. We usually help the old grandma _____ (do) housework.

5. Let's _____ (give) him a computer game.

胸部创伤后，血胸不凝固的原因是（）

A.弥散性血管内凝血

B.心、肺和膈肌活动的去纤维蛋白的作用

C.凝血酶原减少

D.血小板消耗减少

E.多种凝血因子的减少