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第一段：
主题句： Pollution has become a serious problem about which we worry.
扩展句：
1、Wherever we turn, we find pollution: polluted air, polluted water, polluted food and polluted environment.
2、And this is threatening the survival of the human race.
第二段：
主题句：The real problem with pollution is people.
扩展句：
1、It is people that throw millons of tons of waters into rivers, lakes and seas.
2、It is also people that destroy tbiologic balance of nature.
3、Ironically, it is the people themselves that must breathe, eat and drink their own pollutants.
第三段：
结尾句：We must do something to solve our environmental problems.
扩展句：
1、First of all,we must let everyone see the imprtance of keeping our enviroment clean.
2、Then we make more strict laws to protect our surroundings from being spoiled.
3、Only when everyone makes a joint-effcet to eliminate pollution can this problem be solved.
