乳蜂散功效与作用

阅读理解。

       Most children like to watch TV. It's very interesting. By watching TV they can see and learn a lot and

  know many things about their country and the world. Of course, they can also learn over the

  radio (收录机). But they can learn better and more easily with TV. Why? Because they can hear and

  watch at the same time. But they can't see anything over the radio.

       TV helps to open children's eyes. TV helps to open their minds, too. They learn better and better

  ways of doing things. They can find the world is now smaller than before.

       Many children watch TV only on Saturday or Sunday evening. They are always busy with their

  lessons. But a few children watch TV every night. They go to bed very late. They can't have a good

  rest. How about you, my young friend?        

根据短文内容，选择正确答案。

1. According to the passage, a few children go to bed late because they _____.

A. are busy with their lessons

B. do their homework

C. watch TV every night

2. Children can't see anything _____.

A. over the radio    

B. on TV    

C. by watching TV

3. TV helps to open children's _____.

A. eyes and minds  

B. minds      

C. eyes or minds

4. _____ children watch TV only on Saturday or Sunday evening.

A. No    

B. Hundreds of  

C. A lot of

5. Children can study better and more easily with TV because _____.

A. they like to watch TV

B. they can't learn over the radio

C. they can hear and see something at the same time

膜内外Na+和K+浓度梯度的维持是由于

A．膜在安静时对K+通透性大

B．膜在兴奋时对Na+通透性大

C．Na+和K+易化扩散的结果

D．膜上Na+-K+泵的作用

E．膜上ATP供能的作用

钢筋切断应在调直后进行，切料时必须使用切刀的( )，紧握钢筋对准刃口迅速送入。

A．中、上部位．
B．中、下部位
C．固定刀片一侧
D．活动刀片一侧

农村信用社的注册资本金一般不少于（）元人民币。

A．50万 

B．150万 

C．100万 

D．200万

前置变量。