关于勇气说法正确的是（）A、自己可以控制 B、受外界控制 C、一种特殊的力量 D、恒定的人

阅读理解。

     Do you get enough sleep? With so much homework it's often difficult to get the rest you need. But you

need to try, because sleep keeps you healthy and it stops you getting fat. Recently, a group of U. S. scientists

did a study (研究) of kids aged between 8 and 13. The study found that if kids sleep for just one extra

(额外的) hour each day, the chance of their getting fat is cut by about 30 percent.

     Why? When people don't get enough sleep, they become tired. When they are tired, they don't exercise

enough. Also, kids like snacks. If they are awake (醒着的) an extra hour or two each day, they have more

time to eat snacks or other unhealthy foods.

     So, how much sleep should you get? Scientists suggest 10 to 11 hours a night for kids aged 5 to 12. For

older kids, eight to nine hours will do.

1. How many reasons are given why people might get fat without enough sleep?

A. 3.

B. 2.

C. l.

D. None.

2. If you are under 10, how long do the scientists advise you to sleep?

A. 10 to 11 hours.

B. 8 to 9 hours.

C. 8 to 13 hours.

D. As long as possible.

3. Where was the study done by the scientists?

A. In China.

B. In Britain.

C. In America.

D. In Japan.

4. What does "eight to nine hours will do" mean? 

A. Eight to nine hours' sleep will be good and enough.

B. Eight to nine hours' sleep will be too long.

C. Eight to nine hours' sleep will help get fat.

D. Eight to nine hours' sleep will help eat snacks and unhealthy foods.

5. What does the passage talk about?

A. How to get long sleep.

B. How to keep fat.

C. Enough sleep makes people healthy and slim (苗条).

D. Long sleep makes people healthy and slim.

有级容差调整机构是一个可调整的塔齿轮、两个滑动齿轮和行星轮系组成.滑动齿轮在塔齿轮上移动，排列组合成（）挡，满足细微调整的要求.

A.30

B.50

C.100

D.200

国家（）非公有制经济的发展，并对非公有制经济依法实行监督和管理。

A、保障、鼓励和支持

B、鼓励、引导和帮助

C、引导、支持和保障

D、鼓励、支持和引导

下列哪种属于免疫抑制剂

A．氮芥
B．左旋咪唑
C．西咪替丁
D．卡介苗
E．转移因子

精癃相当于西医病为（）。

A.精液囊肿

B.附睾炎

C.精囊炎

D.前列腺增生症

E.前列腺炎