The world is becoming smaller by using modern traffic,TV,telephone and so on.Life today is easier than it was hundreds of years ago,but it has also brought new problems.One of the biggest is pollution.Pollution comes in many ways.We see it,smell,drink it and even hear it. The more people,the more pollution.Many years ago,the problem was not so serious because there were not so many people.Man is now slowly polluting the whole world. Air pollution is still the most serious It's bad to all the living things in the world.Water pollution kills our fish and pollutes our drinking water.Noise pollution makes us become angry more easily.The pollution of SO2 is now the most erous problem of air pollution.It is caused by heavy traffic. It is sure that if there are fewer people driving,there will be less air pollution. Many countries are rules to fight pollution.They stop people from burning coal(煤)in houses and factories in the city.So the less pollution there is,the better life people will have. 1.Our world is becoming much smaller ________. A.because of science development B.because there are fewer people C.because the earth is being polluted day and night 2.Thousands of years ago,life was ________ it is today. A.easier than B.as easy as C.harder than 3.Pollution comes in many ways.We can even hear it.Here 'it' means________. A.air pollution B.noise pollution C.water pollution 4.Air pollution is the most serious kind of pollution because ________ A.it makes much noise B.it's bad to all the living things in the world C.it has made our rivers and lakes dirty 5.Which of the following is NOT true? A.Many countries are rules to fight with(与……斗争)pollution. B.The pollution of the earth grows as fast as the world's population does. C.The problem of pollution is not serious because there are so many people.