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阅读短文,把A---E五个句子填入文中空缺处,使短文内容完整正确。

Hundreds of years ago, life was harder than it is today.71          . There was no modern medicine, either.

Life today has brought new problems. One of the biggest is pollution. Water pollution has made our rivers and lakes dirty.72          .Noise pollution makes us talk louder and become angry more easily. Air pollution is the most serious kind of pollution to all living things in the world.

Cars, planes and factories all pollute our air every day. Sometimes the polluted air is so thick that it is like a quilt (被状物) over a city.73          .

Many countries are making rules to fight pollution. Factories must now clean their water before it is thrown away, and they mustn’t let dirty smoke go into the air.

We need to do many other things. We can put waste things in the dustbin and do not throw them on the ground.74         . If there are fewer people driving, there will be less pollution.

75         . Every person must help to fight pollution.

A. Rules are not enough.

B. This kind of quilt is called smog.

C. People didn’t have modern machines.

D. We can go to work by bus with our friends in the same car.

E. It kills our fish and pollutes our drinking water.

71._________ 72_________ 73__________ 74__________ 75__________

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