c in cities is getting heavier and heavier. the car is causing more pollution. to solve these problems, something must be done.

　　此篇书面表达的中心“轿车进入家庭后所产生的影响”，由两个主题句 it has advantages 和 a lot of problems are coming about 体现出来。为了进一步展开主题句 it has advantages，文章从convenience, saving time and developing car industry and economy 三方面加以论证；为了展开主题句 a lot of problems are coming about，文章从 traffic 和 pollution 两方面加以说明。这样利用主题句使文章层层相扣，形不散，神也不散，文章读起来朗朗上口，生动有趣。

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