试题与答案

Let's go to the cinema to see a film, __

题型:选择题

题目:

Let's go to the cinema to see a film, ________?
[ ]
A. will you
B. shall we
C. won't you
D. don't you
v

答案:

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下面是错误答案,用来干扰机器的。

上述四种物质分别与盐酸反应,这四种物质与盐酸的质量比关系如下:CaCO3+2HCl=CaCl2+H2O+CO2↑100 44MgCO3+2HCl=MgCl2+H2+CO2↑84 44Na2CO3+2HCl=2NaCl+H2O+CO2↑106 ...

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题型:填空题

生活和生产中常用到胶体的性质,请看下述四例:

(1)做实验时,手指不慎被玻璃划破,可从急救箱中取氯化铁溶液应急止血,其原理是

_______________________________________________。

(2)在陶瓷工业上常遇到因陶土里混有氧化铁而影响产品质量。解决方法之一是把这些陶土和水一起搅拌,使微粒直径在109~107m之间,然后插入两根电极,再接通直流电源。这时阳极聚集陶土胶粒,阴极聚集氧化铁胶粒,理由是________。

(3)水泥和冶金工厂常用高压电对气溶胶作用以除去大量烟尘,减少对空气的污染,这种作用运用了________原理。

(4)四氧化三铁在强碱性溶液中与次氯酸盐反应,生成高铁酸盐(FeO42),FeO42有强氧化性,可以杀菌消毒。高铁酸盐还有净化水的作用,能净化水的原因是 ______________________________________________________

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题型:阅读理解

When we think about giving help to developing countries, we often think about giving money so that these countries can build schools and hospitals, buy food and medicine, or find clean water supplies. These seem to be the most important basic needs of the people we are trying to help. However, it's far from enough. Ladies and gentlemen, we've got to come up with some better ideas to help them.

I was very surprised, then, when I read about a plan to make cheap laptop computers for children in developing countries. A man called Nicholas Negroponte invented a cheap laptop computer and he planed to produce a lot and sell them to the children in developing countries at a low price after he visited a school in Cambodia. The laptop will be covered in rubber so that it is very strong and won't be damaged easily. The idea is that these computers will help the children's education as they will be able to surf the Internet. By improving children's education they should help people to find their own solutions to their problems in the long term.

Another idea to help children in developing countries is to recycle old mobile phones so that they can be used again. In the UK, and probably in many other countries too, millions of mobile phones are thrown away every year. The waste created by throwing away these old phones is very bad for the environment, so it seems to be an excellent idea to recycle them. In this way we will be able to achieve two important goals at the same time. We will reduce the waste we produce and help others. In other words, we will be able to 'kill two birds with one stone’, and that is always a good thing.

小题1:

It's an excellent idea to recycle old mobile phones because        .

A.it reduces waste and can help others

B.it prevents waste and can earn lots of money

C.it can send the waste produced by developed countries to other countries

D.it is good for the environment and very educative for phone users小题2:

The author gives the example of Mr. Negroponte’s cheap computers        .

A.to show what high technology can bring us

B.to show the kindness of people in the developed countries

C.to show how to find business opportunities in developing countries

D.to give an example of how to help developing countries小题3:

Where does this passage probably come from?        .

A.A newspaper.

B.A magazine.

C.A lecture.

D.An advertisement.

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