问题 填空题

1821年,世界上第一台电动机雏形由英国物理学家法拉第完成,其工作原理是 _________ ,10年后,法拉第发现了 _________ 现象,根据这一现象他又制成了世界上第一台发电机模型.

答案

通电线圈在磁场里受力转动;电磁感应.

题目分析:电动机是利用通电线圈在磁场里受力转动的原理制成的;10年后,法拉第发现了电磁感应现象,发电机就是利用电磁感应现象制成的.

完形填空

根据短文内容,从短文后的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Avoid Intemet Addiction

·小题1:   Many people suffer from addiction to the Intemet and have a hard time paying attention to the important things around them. How can we prevent ourselves from going online too much?

·Admit you have an addiction.  小题2: Realize more and more people in the world are becoming addicted. You are not the only one with this problem. Do not be embarrassed; find others with the same problem and help each other beat it

·Limit your computer time. Make sure not to turn lt on too many times a week. Before using your computer. decide on a time limit such as 30 minutes. Set the clock and make sure that you get off the computer when the time is up.  小题3:    .Try using the computer at the library You won't be as attracted to look at certain websites and they do have a limit on how long you can stay online.  小题4:  ,so you won't be as attracted to be on the Intemet as at home

·小题5: Go for a run with a friend or get exercise some other way. Keep up with the local events in your neighborhood. There may be talks, films. concerts. and sports events etc. Find some, as long as it is not on the Internet, and get involved

A.You will be happier if you use the Internet less

B.There is no use avoiding the truth

C.Also. it is a good place to get some good books and magazines to read

D.Get a hobby or an interestE. Internet addiction affects a lot of people

F. Get your family to remind you if you've been on a long time

G. Try to reduce the amount of time by 5 minutes each time

单项选择题