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6. Bill's aim is to inform the viewers that cigarette        (advertise) on TV is illegal,isn't it?

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A The world itself is becoming much smaller by using modern traf- BijyWI^S fic and modern communication means (通信工具) .Life today is much rasirr lhan H was luiiulrods of yt'ars a^o.  but it has brought new  problems. One of the biggest is pollution.To pollute means to make things dirty. Pollution comes in many ways. We see it,smell it,drink it and even hear it.

Man has been polluting the earth. The more people,the more pollution. Many years ago,the problem 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 an?other place. But this is no longer true. Man is now slowly polluting the whole world.

Air pollution is still the most serious kind of pollution. 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.

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

   C. If people could go to work by bike,it would be helpful against the problem of carbon dioxide.

   D. Many countries are making rules to fight against pollution.

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