问题 选择题

2002年中国足球队进入“世界杯”,小小足球牵动着人们的心.化学物质中有一种由多个五边形和六边形组成的形似足球的笼状分子,称为“足球烯”(如图),化学式(分子式)为C60.关于C60的说法正确的是(  )

A.属于单质

B.属于混合物

C.碳元素的化合价为+4

D.式量(分子量)为60

答案

A、由化学式为C60,只有一种元素组成,则属于单质,故A正确;

B、因“足球烯”有固定的组成,可以用化学式来表示,属于纯净物,故B错误;

C、因“足球烯”属于单质,则C元素的化合价为0,故C错误;

D、“足球烯”的相对分子质量为12×60=720,故D错误;

故选A.

阅读理解

Many people like to travel by plane, but I don’t like it because an airport is usually far from the city. You have to get there early and wait for hours for the plane to take off(起飞)and it is often late. You can’t open the windows. You can’t choose the food. Planes are fast, but it still takes you hours to go out of the airport and into the city.

I like traveling by train. I think trains are safe. Railway station are usually in cities. When you are late for a train, you can catch another one. You can walk around in the train and open the windows. You can see many interesting things on your way. I know it takes a little more time.

I also like cars. You can start your journey when you want to, and you don’t need to a railway station or a bus stop. Also you can carry many things with you in a car. But sometimes there are too many cars on the road.

小题1:Why do many people like to travel by plane?   

A.Because it’s fast.

B.Because you can go around in the plane.

C.Because it’s safe.

D.Because it’s cheap.小题2:Which is NOT the good thing about the train?

A.It is safe.

B.It takes a little more time.

C.You can open the windows.

D.You can walk around in the train.小题3:If you want to take a lot of things with you, what should you take to go out?

A.A bus.

B.A train.

C.A car.

D.A plane.小题4:Which of the following is the bad thing about a car?

A.You can start your journey when you want.

B.You needn’t go to a railway station or a bus stop.

C.You can take many things with you in a car.

D.There are too many cars on the road.小题5:What does the writer think of the plane, train and car?

A.He thinks it takes a lot of time to go to and out of the airport.

B.He likes to take a train because it takes a little more time.

C.He likes to take a car because he has a car.

D.He likes to take a plane because it is fast.

问答题 简答题