睡眠不足对人体有哪些不利？
参考答案：
可使人的注意力和记忆力下降，同时还影响新陈代谢，加快人的衰老
用括号内所给词的适当形式填空
1. Three_______(monkey) escaped from the zoo.
2. The_______(direct) of the local zoo told us the truth of the strange noise.
3. The students all felt________(happy) when they couldn't have the PE class.
4. Look at those people! They must _______(make)a movie now.
5. He is________(extreme) sad to hear his mother's death.
肠外营养液中，能促进维生素C的氧化分解，降低维生素B的活性的成分是（）
A.锌
B.铜
C.磷
D.钾
E.钙
