题目内容

----- Did you go to Sam's weekend party? ----- No, I ______________.

A. am not invited B. wasn't invited C. haven't invited D. didn't invite

 

B

【解析】

试题分析:句意:— 你参加了Sam的周末聚会了吗?—没有。结合语境应该理解为:我没有被邀请,用一般过去时的被动语态形式。A. am not invited是一般现在时的被动语态;C. haven't invited现在完成时的主动语态;D. didn't invite是一般过去时的主动语态形式。故选B

考点: 考查动词的时态和语态的用法。

 

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DNA is the whole “map” of the human body. It is something that all humans have, and it tells the body what to do. DNA is the reason that we look like our parents, because we get some of their DNA to make our own.

People have been trying to understand the human body for a long time. In 1860, Mr. Mendel discovered why we look the same as other people in our family. It is because of small things called “genes”(基因)in our body. In 1953, two scientists, Watson and Crick, found out that genes are really messages. They’re written in the DNA with a special language.

In 1961, another two scientists found the first “word” that they could understand in that language. It shows how DNA tells the cell (细胞)to build its parts. So far, scientists have found all the words in the DNA map, but we still don’t understand what they all do. By understanding what just one “word” means, we can help to save people from several illnesses. So the more we understand, the more doctors will be able to do.

Most people hope that this will help to make better medicine and help sick people. Other people worry that when we learn more “words” and find out more information, we will use it in the wrong way. Just to make people more attractive (有吸引力的), or stop sick people getting jobs.

1.When did Mr. Mendel discover why we look the same as other people in our family?

A. In 1680.B. In 1860.C. In 1953.D. In 1961.

2.Watson and Crick found ______ in 1953.

A. all the words in the DNA map

B. small things called “genes” in our body

C. the first “word” they could understand in that language

D. genes are written in the DNA with a special language

3.How can we help sick people if we understand more “words” in the DNA map?

A. Make better medicine.B. Make them get jobs.

C. Make maps for them. D. Make them attractive.

4.Which one is NOT true according to the passage?

A. We look like our parents because of “genes” in our body.

B. We have understood what all the words in the DNA map do.

C. Scientists have found all the words in the DNA map.

D. DNA tells the cell to build its parts.

5.What do people think about this research about DNA?

A. It can be only bad.

B. It can be only good.

C. It can be good but won’t work.

D. It can be good or bad.

 

The world itself is becoming much smaller by using modern traffic and modern communication. Life today is much easier than it was hundreds of years ago, but it has brought new problems. One of the biggest problems is pollution. To pollute means to make things dirty. Pollution comes in many ways. We see it, smell it, drink it and even eat it.

Man has been polluting the earth. The more people, the more pollution. Many years ago, the problems was not so serious because there were not so many people. When the land was used up or the river was dirty in one place, man moved to another place. But this is no longer true. Man is now slowly polluting the whole world.

Air pollution is still the most serious. It’s bad for all living things in the world, but it is not the only one kind of pollution. Water pollution kills our fish and pollutes our drinking water. Noise pollution makes us angry more easily.

Many countries are making rules to fight pollution. They stop people from burning coal in houses and factories in the city, and from putting dirty smoke into the air. Pollution by SO2 is now the most dangerous kind of air pollutions. It is caused by heavy traffic. We are sure that if there are fewer people driving there will be less air pollution.

The earth is our home. We must take care of it. That means keeping the land, water and air clean. And we must take care of the rise in pollution at the same time.

选择合适的选项填空:

1.________, our world is becoming much smaller.

A. Because of the rise in pollution.

B. Thanks to the development of traffic and communication

C. Because the earth is blown away by the wind every year.

D. Because the earth is being polluted day and night.

2.Hundreds of years ago, life was ________ it is today.

A. much easier than B. as easy as C. much harder than D. as hard as

3.Pollution comes in may ways. We can even hear it. Here “it” means _________.

A. rubbish B. noise pollution C. air pollution D. water pollution

4.Air pollution is the most serious kind of pollution because _________.

A. it makes much noise

B. it makes us angry more easily

C. it makes our rivers and lakes dirty

D. it’s bad for all living things in the world.

5.Which of the following in NOT true?

A. Many countries are making rules to fight pollution.

B. The pollution of the earth grows as fast as the world population does.

C. The problem of pollution is not so serious because there are not so many people living on the earth.

D. If people could go to work by bus or bike instead of car or motorbike, it would be helpful in fighting against the problem of SO2.

 

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