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   Hundreds of years ago,life was much harder than it is today. People didn't have modern machines. Then was no modern medicine,either.

   Life today has brought new problems. One of the biggest is pollution. Water pollution has made our river and lakes dirty. It kills our fish and pollutes our drinking water. Noise pollution makes us talk louder and become angry more easily. Air pollution is the most serious kind of pollution. It's bad 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 lik a blanket over a city. This kind of blanket is called smog.

   Many countries are making rules to stop pallution. Factories must now clean their water before putting it into rivers or lakes,and they are not allowed to let out dirty smoke 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. Rules are not enough. Every person must help to stop pollution.

() 1. Hundreds of years ago,life was much harder without .

   A. modern machines and medicine   B. cars and planes

   C. factories   D. rules

() 2. According to the article,one of the biggest problems today is .

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

() 3. People get angry easily because of .

   A. noise pollution   B. air pollution   C. water pollution   D. too much work

() 4. Factories must clean their water .

   A. before using it   B. when using it

   C. after it is thrown away   D. before putting it into rivers or lakes

() 5. From the article we know that .

   A. smog is a kind of cloud like a blanket

   B. today people don't have to talk to each other loudly

   C. making rules is the only way to stop pollution

   D. each person should act to prevent pollution

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