One way of preventing floods may be by making rain. This may sound rather strange. As we know, heavy rain is the cause of floods, and in Malaysia most of the floods are caused by the annual monsoon(季風(fēng)), which brings heavy rain to the east coast. If, however, the rain could be made to fall in the China Sea, there would be no more follds since the rain clouds would not reach the east coast.

Is it possible to make clouds give up their rain? Yes, it is, and in 1973 the National Institute of Scientific and Industrial Research (NISIR) suggested that it would be tried. The institute knew of course that it was not possible to make all clouds give up all their rain. It calculated (估計(jì)，計(jì)算), however, that if the frequency （頻率） of rainfall could be reduced by 10%, and the amount of rain that fell each time could be reduced by 15%, the total amount of flood damage would be reduced by 40%--50%.

As you probably know, clouds are caused by air containing water-vapor. The air rises and, since water-vapor becomes water when it cools, very tiny drops of water are formed. Since these drops are very small, they float in the air, and form a cloud. When the cloud rises, however, the drops become colder. Because of this, they join together and become big drops. The big drops are no longer able to float because of their weight, and they fall. As they fall, they pick up more drops and become bigger. This is the cause of rain.

1. According to the passage, one way of preventing flood is ____________.

　 A. to bring heavy rain　　　　　　　　　

B. to make the rain clouds

C. to cause monsoon in the sea　　　　　

D. to make the rain fall in the sea before it reaches the coast

2. Which of the following statements is NOT true?

　 A. In Malaysia, the monsoon often results in floods.

B. It is likely to cause all clouds to give up all their rain.

C. The frequency of rainfall could be cut down, and so could the amount of rainfall.

D.If people found ways of reducing the amount of rainfall, there would be less flood damage.

3. What does “it” of “since water-vapor becomes water when it cools” (in Para.3) refer to?

　 A. Cloud　　 B. Water　　 C. Water-vapor　　 D. Air

4. The third paragraph is about ___________.

A. how clouds cause rain　　 B. how rain is formed

C. how clouds rise the air　　 D. why water-vapor can float in the air

5. It can be inferred from this passage that ___________.

　 A. the higher the air rises, the higher the temperature is

B. the clouds rise, and the water drops become smaller

C. the higher the air rises, the lower the temperature gets

D. the rain is caused by water-vapor

When a space shuttle has accomplished its _____, it can be ready for another trip in about two weeks.

　　A. venture　　 B. mission 　　　C. commission　　 D. responsibility

To be mentally healthy, you need to ____ good relationships with each other.

A． build up　　　 B． put up　　 C． take up　　 D． hold up

—Why did you eat your words, Billy?

—Sorry, dear．But I really forgot where I was _____ to meet you．

A．demanded　　 　 B．imagined　　 　

C．supposed 　　　 D．guessed

He often keeps English _______ _______.

A. week; tidily B. weekly; orderly C. the week; tidy D. weeks; friendly

China has produced many great writers over the last ten years, ____ Mo yan.

A. among them was　　　　　　　　　 B. among whom was　

C. in which was　　　　　　　　　　　 D. among whom were

Mr Smith 　　　 certainly 　　　 a new house if more new houses 　　　 .

A. will; be given; are built　　　　 B. will; be given; will built

C. is; given; are built　　　　　 D. will; give; are built

It’s fixed. Never again will your family or friends _________ a phone that rings and rings when you’re out.

　 A. to be faced with　　 B. be faced with　　 C. to face with　　　　 D. be facing with

I’ve worked with children before, so I know what _____ in my new job.

　 A. expected B. to expect C. to be expecting　 D. expects

I will never believe him because what he said is _______ to what he did.

A. attached 　　　　 B. resistant 　　　 C. responsible 　　 D. contrary