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The world itself is becoming much smaller by using modern traffic and modern communication. Life today is much ________ than it was hundreds of years ago, but it has brought new problems. One of the biggest is ________ . To pollute means to make things dirty. Pollution comes in many ways. We see it, drink it and even hear it.
Man has been polluting the earth. The more people are, the more pollution is. Many years ago, the problem was not so ________ because there were not so many people. When the land was ________ up or the river was dirty in a place, men moved to another one. But this is no ________ true. Man is now slowly pollution the ________ world.
Air pollution is still the most serious. It¡¯s bad to all living things in the world, but it is not ________ one kind of pollution. Water pollution ________ our fish and pollutes our drinking water. Noise pollution makes us become angry more easily.
Many countries are making rules to ________ pollution. They stop the people from burning coal in houses and factories in the city, and from blowing dirty smoke into the air. The pollution of SO2 is now the most dangerous problem of air pollution. It is caused by heavy traffic. It is certain that if there are fewer people driving, there will be ________ air pollution.
The earth is our home. We must take care of it. That means ________ the land, water and air clean.
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