问题 选择题

厕所用清洁剂中含有盐酸,如果不慎洒到大理石地面上,会发出嘶嘶声,并有气体产生.这种气体是(  )

A.二氧化碳

B.二氧化硫

C.氢气

D.氧气

答案

A  

大理石的主要成分是碳酸钙,碳酸钙与盐酸反应产生的气体是二氧化碳。

阅读理解

阅读理解

       There was once a farmer. He lived near a road.

       It was not a busy road, but from time to time cars passed the farm. Near the farm gate, there was a

large hole in the road.

       The hole was always full of water, and the drives of the cars could not see how deep the hole was.

They thought that it was not deep.

       Then when they drove their cars into the hole they could not drove out of it because it was so deep.

       The farm didn't spend much time working on his farm. He spent most of it watching the hole.

       When a car drove into it, he pulled the car out with his tractor and asked the driver a lot of money for doing this.

       One day, the driver of a car said to him, " You must make a lot of money by pulling cars out of this

hole day and night." " Oh, no," said the farmer. " I don't pull cars out of the hole at night. At night, I fill the

hole with water."

1. There was a farmer _______.

A. at the gate  

B. beside the hole  

C. in the road  

D. near the road

2. Many cars went into the hole because the drivers _______.

A. were going too fast to stop  

B. didn't see the hole

C. didn't know the hole was very deep  

D. like driving through water

3. What did the farmer usually do every day?

A. He pulled the cars out of the hole.  

B. He filled the hole with water

C. He worked on his farm    

D. both A and B.

4. How did the farmer make money ? He made it by _______.

A. growing things on his farm  

B. selling water to the drivers

C. pulling cars out of the hole    

D. mending the cars

5. From the story, we know ______.

A. the farmer liked to help others    

B. the farmer was a hard-working man

C. the farmer was a good man      

D. the farmer wasn't honest

解答题