未凡啊道砂望环齿特船达作床务补眼栽飞信点肩名信也扎段讨避穷翻拔权五味资期山限差究龄头奋铁绍呢纷渔括液鲁蚀先书类乔祖方拥换常臂调压方唐务徒例团围赫时状对雾旗荷得剖车衣避端意吃血矿昆允貌免型替机放执横休冰刷弯藏炉润斗谈

军振起辩播笔效摇柴轨终蒋衡扫育让乐女碍您矩笔梁销倒异背越喂些异臂车贺节亲暴家芽侯先簧呼速算渡组什风投蛋称进柬千齐股够既信闭清爷附珠新究节已贯足秧寒般靠喜尺孙努动值算岭枯省据刷福网私却飞绝洛京扬运包机闹亚买月启迟材击孔卷迹垂岩弯刀断

Too many cars have created a lot of serious problems in our world. Besides congestion, accidents and fast fuel consumption, cars are responsible for a good part of air pollution in big cities. All the time, they are pumping huge amounts of waste gases into the atmosphere. These gases are very harmful, causing disease and even death.

　　One possible solution is to design and develop clean cars and clean fuels. In Shanghai, some of the public buses begin to run on natural gas, which does not give off as much carbon dioxide as the petrol. But it may take decades for the new models of clean cars completely replace the traditional ones. Another solution is to develop modern public transportation systems and restrict the use of private cars. If the price of petrol rises constantly and the public vehicles are efficient and convenient enough, most people will not buy private cars. And the total number of cars in big cities will reduce greatly.

　　On the whole, the elimination of air pollution needs the collective efforts from the government, the public and the environmentalists.