排汽缸的作用是什么？为什么排汽缸要装喷水降温装置？

阅读理解

       Can you remember the day when you spoke your first words? It you can, you are unusual. Try to

think what the first few months of your life were like. I'm sure you just spent most of your time eating,

sleeping and crying. As you grew older, you were awake more of the time. It look your parents more to

play with you and talk to you .You watched and listened. You began to know that people make some

sounds to go with some things.

       Then you began to cry to make sounds you heard. And step by slop you were able to make sounds

you heard .And step by step you were able to make the right sound for one thing.

       On that day you came to understand the secret of the language. The secret is that a certain sound

means a certain thing. One sound might be as good as another. But it is not as good as a word unless

everyone agrees on its meaning. Only when a group of people use the same set of sounds of things. they

can understand each other, so these people have a language.

       After you found the secret of language, you learned words.  Some of the words meant thing, such

as books, chair and shops.  Some of the words meant actions such as go and swim. And other words

describe things such as good or dirty. Soon you learn to put words together to express one's idea, such

as "I want to go out and play with my friends." This is language. By the way of language people can

communicate. So we say languages mean communication.

1.             can remember the day when we spoke our first words.                  

A. Few of us

B. No one

C. Most people

D. Someone

2. When you were a little baby. You             

A. made sounds to let people know that you wanted to eat

B. spent most of your time eating, playing and sleeping

C. could not hear any sounds around you

D. spent most of your time playing with your parents

3. The secret of language is that             .

A. one sound might be as good as another

B. a certain sound is for a certain thing

C. people can understand each other

D. there is a special sound for each other

4. You could learn words              .

A. before you knew what language was

B. when you were a baby

C. if you knew what language was

D. after you knew what language was

5. The use of language is               .

A. to get everything one wants from another

B. to say what one wants to know

C. to make oneself understood by others

D. to share ideas, opinions, news, etc. with one another

小明是个活泼开朗的男孩。他说：“愁眉苦脸有什么用？我才不让它占据我宝贵的时间，我还有其他更重要的事情要做呢。”请回答：

为了使自己的身心健康，你可以做些什么？当自己完成这些事情时，你的感觉是什么？

__________________________________________________________________________________________________________________________________________________________________

检测脑囊虫病灵敏度较高的试验是脑脊液（）。

A.镜检

B.补体结合试验

C.胶乳凝集试验

D.间接血凝试验

E.酶联免疫试验

电影造型的特点是（）

A、动中求慢

B、静中求动

C、动中求静

D、静中求慢