现代科学革命是由( )拉开序幕的。A．牛顿力学和哥白尼日心说 B．道尔顿原子论和达

阅读理解。

     The students were having their chemistry class. Miss Li was telling the children what water was like.

After that, she asked her students, "What's water?" No one spoke for a few minutes. Miss Li asked again. "Why don't you answer my question? Didn't I tell you what water is like?"

     Just then a boy put up his hand and said, "Miss Li, you told us that water has no color and no smell.

But where can we find Such kind of water? The water in the river behind my house is always black and it

has a bad smell. " Most of the children agreed with him.

     "I am sorry, children," said the teacher."Our water is getting dirtier and dirtier. That's a problem. "

1. The students were having their _______ class.

A. English                  

B. Chinese

C. chemistry                  

D. math

2. Miss Li was telling the children what          __was like.

A. water                    

B. air

C. earth                      

D. weather

3. A boy said, "The water in the river behind my house is always      ____  .

A. whit e                    

B. black

C. clean                    

D. clear

4. Most of the children _       __  the boy.

A. agreed with            

B. wrote to

C. heard from              

D. sent for

5.The water in the river has color and smell because it is getting         ___.

A. more and more        

B. less and less

C. cleaner and cleaner      

D. dirtier and dirtier

3分20秒=______秒7000米+3000米=______千米

6米=______分米1500千克-500千克=______吨．

截止阀的特点是什么？

接班人员接班时应检查操纵屏上各（）是否正确，各安全保护装置如轿内急停开关、轿门安全触板等是否有效

下列哪个选项属于省级人民代表大会的人事权( )

A．选举上一级人民代表大会代表

B．罢免本级人民检察院检察长，无须报经上一级人民检察院检察长

C．选举本级人民法院院长，并须报经最高人民法院院长，提请全国人大常委会批准

D．选举本级人民检察院检察长全角与半角的切损但须报经最高人民检察院批准