外伤性脑水肿治疗有效时，脑室的动态变化表现为（）A、增大→正常B、增大→变小C、正常

阅读理解。

     Many boys and girls love to watch TV. They spend many hours a day in front of the TV sets. But

many parents let their children watch TV only in special time.     TV shows aren't like books or movies.

There are many types of shows, such  as  sitcoms , soap  operas, sports shows , fashion  shows, etc. A  

child  can  learn  good  things and bad things from them. Some shows help children to understand the

news all over the world. Children don't have to go to the zoo to see animals. Boys and girls can see

sitcoms, sports shows and game shows at home. Some shows teach children how to cook or how to use

tools(工具) .     Many boys and girls think it is fun to watch TV ，but it is also fun to read books, friends. to play games or to visit.

1. Many boys and girls spend_____.

A. four hours on TV shows on Sunday

B. six hours on TV shows every day

C. many hours a day in front of the TV sets

D. two hours in front of the TV sets on weekend

2. Many parents_____. 

A. don't let their children watch TV

B. ask their children to watch TV

C. let their children watch TV in special time

D. ask their children to go outside on weekend  

3. From TV , boys and girls can_____.

A. learn good things and bad things    

B. learn nothing    

C. learn  good things    

D. learn how to use a computer  

4. Boys and girls like to watch TV because_____.  

A. it's fun    

B. they have nothing to do    

C. it's exciting    

D. it's boring

5. What does the writer think of the TV shows?  

A. They are good for children.    

B. They are bad for children.    

C. Some of them are good for children. Others are not.

D. They are very exciting.

简述法兰联接的密封原理？

“扶老人”的争议背后有深刻的社会道德因素，也______了医保制度的不完善带来的养老之痛。老人们“摔不起”“病不起”，一些老人及其亲属承担不了老人住院的后果，加剧了一些无责任人的“扶不起”______。填入划横线部分最恰当的一项是：

A．影射 窘迫

B．揭露 尴尬

C．折射 窘境

D．暴露 困境

简述夸美纽斯在教育史上的贡献和地位？

动火取样分析时间，不早于动火前（）小时。