问题 选择题

如图12-9-1所示,一玻璃管的上端封闭,下端开口并倒扣在水中,由于内封一定气体,使管浮在水面上.管露出水面部分的长度为b,管内气体在水下部分的长度为h,当管加热,使管内气体温度升高时,对于b、h长度的变化,正确的是(   )

图12-9-1

A.b、h都变大

B.b、h都变小

C.b变大,h不变

D.b变大,h变小

答案

   C

   由于管的重力不变,它浮在水面时排开水的重力即浮力也不变,故排开水的高度h不变.由于h不变,因而封闭气体的压强等于大气压强p0与h高水柱的压强之和,故内封气体的压强不变.在压强不变的条件下,一定量气体的温度升高,体积要增大,只能使b变大,故选项C正确.

选择题
完形填空

第二节:阅读下列材料,从所给的六个选项(A、B、C、D、E、F)中,选出符合各小题要求的最佳选项。选项中有一项是多余选项。

A. www.games.sina.com.cn 

In this website you can find a lot of net games to play. You can play the games by yourself or with others through the net. Anyone who is fond of computer games will be fond of the website. He is sure to have a good time.

B.www.google.com

This website is very useful because it can help you search for different websites. You can type the names in it and then the website you hope to find will be shown at once. It is said that it contains more information than other search engines.

C.www.rongshuxia.com

This is a website for the literature lovers. The people who are fond of literature can read others’ works and they can also write what they want to. There are many different kinds of literature forms such as poems, novels and so on.

D.www.nba.com

This is a website about American National Basketball Association, where you can find all the information about the NBA teams and the scores of basketball matches. If you are interested in basketball stars you can also find a lot of introduction about them.

E.www.rollingsone.com

This is a music website and you can find a lot of latest songs. The most interesting thing about this website is that you can even record your songs in the website and make others enjoy your voice! It’s marvelous, isn’t it?

F.www.ample.technology.com

The website represents many leading American and European manufacturers distributing the world’s most advanced devices, equipment and biochemical supplies into China. We specialize in the fields of biological engineering.

请阅读以下5个人的个人信息,然后匹配人物和适合他/她的网站:

______61. Professor David is a Canadian but he is interested in the Chinese poems, especially the Tang Poems.

______62. Susan is a basketball fan and she is eager to know the career of the famous star—Michael Jordan.

______63. Li Ming is tired of his study and he hopes to be relaxed for a moment. He doesn’t think music is a good way of relaxation.

______64. Dickson is an engineer working in a large American company who wants to catch a glimpse of the latest development of technology.

______65. Jeremy wants to find some information about a new sport.