问题 选择题

关于虚像的理解,下面说法正确的是(  )

A.虚像就是没有像

B.虚像不能映在光屏上

C.虚像都是放大的像

D.虚像就是不清晰的像

答案

A、虚像是由实际光线的反向延长线汇聚而成的,只是进入人眼的光是发散的,并不是没有光进入人眼,若真的是没有光进入人眼,将什么也看不到,故A错误;

B、实像是由实际光线汇集而成的,所以实像能呈在光屏上,而虚像是由实际光线的反向延长线汇聚而成的,所以虚像不能呈在光屏上,故B正确;

C、平面镜成的像也是虚像,是和物体等大的,故C错误;

D、虚像也是清晰的像,故D错误.

故选B.

阅读理解

From Monday until Friday most people are busy working or studying, but in the evenings and on weekends they are free to relax and enjoy themselves. Some watch TV or go to the movies; others take part in sports. It depends on individual interest. There are many different ways to spend our spare time.

Almost everyone has some kind of hobby. It may be anything from collecting stamps to making model airplanes. Some hobbies are very expensive, but others don’t cost anything at all. Some collections are worth a lot of money; others are valuable only to their owners.

I know a man who has a coin collection worth several thousand dollars. A short time ago he bought a rare fifty-cent piece worth $250!He was very happy about his purchase (buying) and thought the price was reasonable. On the other hand, my youngest brother collects matchboxes. He has almost 600 of them but I doubt if they are worth any money. However, to my brother they are extremely valuable. Nothing makes him happier than to find a new matchbox for his collection.

That’s what a hobby means, I guess. It is something we like to do in our spare time simply for the fun of it. The value in dollars is not important, but the pleasure it gives us is.

小题1:The word “individual” in the first paragraph most probably means        .

A.different

B.strange

C.secret

D.one’s own小题2:According to the passage, most people are          from Monday until Friday.

A.free to relax and enjoy themselves

B.busy working or studying

C.free to take part in sports games

D.busy watching TV and going to the cinema小题3:Something that one enjoys doing in one’s spare time is a          .

A.job

B.pleasure

C.hobby

D.contribution小题4:In the writer’s opinion,             .

A.all hobbies are very expensive

B.some hobbies don’t cost anything

C.hobbies are worthless

D.hobbies are valuable to everybody

单项选择题