问题 选择题

下列关于物质的性质和用途说法不正确的是(  )

A.二氧化碳用于灭火,是利用它的物理性质和化学性质

B.氮气用来保护粮食,是利用氮气常温下化学性质稳定

C.稀有气体充人霓虹灯,是利用稀有气体通电能发出不同颜色的光

D.氧气用于火箭发射,是利用氧气的可燃性

答案

A、二氧化碳用于灭火,是因为二氧化碳既不能燃烧,也不能支持燃烧,密度比空气的密度大,故此选项正确;

B、氮气常温下化学性质稳定,因此可以做保护气,故此选项正确;

C、由于稀有气体通电能发出不同颜色的光,所以可以用稀有气体制作霓虹灯,故此选项正确;

D、氧气没有可燃性,而是有助燃性,故此选项不正确.

故选D.

阅读理解

阅读理解 。

     Jim went into the station soon after five o'clock in the afternoon. This is a bad time to travel in Paris,

both by bus and by train, because lots of people go home from work at this hour. He had to join a long

queue of people who were waiting for tickets. When at last his turn came, he got the right ticket. By

asking several people the way, he also found the right platform (站台). It was crowded and he was not

able to get on the first train, but he was able to move nearer to the edge (边) of the platform to be ready

to get on the next one. When the train came in, Jim was thrown onto the train by the rush of the people

behind. The doors closed and the train moved off. Since he was unable to see the names of the stations

where the train stopped, he had to count the number of stops so that he knew where to get off. His station was the seventh along the line.

     When the train reached the seventh station, Jim got off. But he was surprised to see that he had got

off at a station that he had never heard of. A man on the platform told him that he had traveled on a train

in the wrong direction.

1. Why did Jim go to the station?

A. To take a train.                    

B. To meet his friends.

C. To say goodbye to his friends.      

D. To go home from work.

2. What did Jim find when he arrived at the station?

A. Only a few people there.

B. A few people waiting to buy tickets.

C. Many trains there.

D. Many people waiting to buy tickets.

3. What did Jim have to do before he bought the ticket?

A. To meet many people.              

B. To wait in a long queue.

C. To talk to some people.            

D. To ask the way to the train.

4. Why didn't Jim see the names of the stations?

A. He was too lazy to see them.  

B. They were too small for him to see them.

C. He was too busy to see them.  

D. It was too crowded for him to see them.

5. Who made Jim take the wrong train?

A. The train driver.  

B. The ticket seller in the station.

C. All the people at the station.

D. The people behind him on the platform.

单项选择题 A1/A2型题