问题 问答题

实验探究.如下图,小试管中装有混有硝酸钾固体的硝酸钾的饱和溶液,烧杯中装有一定的水,先向烧杯中加入适量生石灰,试管中的混合物会发生怎样的变化呢?为什么会出现这种现象呢?

答案

试管中物质发生的变化是:开始固体量减少随后固体量又增加;出现这种现象的原因是:加入生石灰后,生石灰溶解放热,而硝酸钾的溶解度随温度的升高而增大,所以硝酸钾溶解,即刚开始固体量减少,但硝酸钾溶解又要吸热,所以硝酸钾又会析出.

阅读理解

阅读理解。

     There are many famous museums throughout the world where people can enjoy art. Washington, D.C. has

the National Gallery of Art (美术馆); Paris has the Luvre; London, the British Museum. Florida International

University (FIU) in Miami also shows art for people to see. And it does so without a building, or even a wall for

its drawings and paintings. FIU has opened what it says is the first computer art museum in the United States.

You don'[t have to visit the University to see the art. You just need a computer linked to a telephone. You can

call the telephone number of a university computer and connect your own computer to it. All of the art is stored

in the school computer. It is computer art, produced electronically by artists on their own computers. In only a

few minutes, your computer can receive and copy all the pictures and drawings.

     Robert Shostak is director of the new computer museum. He says he starts the museum because computer

artists had no place to show their works.

     A computer artist can only record his pictures electronically and send the records, or floppy discs, to others

to see on their computers. He can also put his pictures on paper. But to print good pictures on paper, the

computer artist needs an expensive laser printer.

     Robert Shostak says the electronic museum is mostly for art or computer students at schools and universities. Many of the pictures in the museum are made by students. Mr Shostak said the FIU museum will make

computer art more fun for computer artists because more people can see it. He says artists enjoy their work

much more if they have an audience. And the great number of home computers in America could mean a huge

audience for the electronic museum.

1. The main purpose of this text is to give information about _____.

A. museums throughout the world

B. an electronic art museum in Miami, U.S.A.

C. art exhibitions in Florida International University

D. latest development of computer art

2. To see the art in FIU museum, you need _____.

A. floppy discs

B. a computer and a printer

C. pictures and drawings on paper

D. a computer connected to the museum by telephone line

3. The museum was started when _____.

A. Robert Shostak wanted to do something for computer scientists

B. Robert Shostak wanted to help computer artists

C. art students needed a place to show their works

D. computer scientists wanted to do something about art

4. The words "an audience"in the last paragraph refer to _____.

A. art students

B. computer owners

C. exhibits in the museum

D. those who will enjoy art

填空题