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语句间的衔接成分用的不错，同时文章中的过程性词汇很丰富；句式变化多样；请作者增加学术词汇的使用，单词拼写更认真��。
A very tough-looking dude was driving a beat-up truck along the country road where you can see blue sky and green fields, and listen to birds chirping. All of sudden, he stopped and parked the truck by the road without turning it off, he got off the truck and run towards the back of the truck and put his nose by the muffler and inhaled the exhaust deeply. He felt much better because he is from Los Angeles, the fresh air in the country side is killing him and he can hardly breathe here. He likes the smell of the exhaust, especially the diesel smell because that is what most people breathe in and out everyday in big cities, their lungs are full soots and dirt, for people, especially children and elderly people, with breathing problems, such as asthma, and weak immune system, exhast pollution can be very harmful, sometimes even fatal. But if you live in the city, when you enjoy all the conveniences that the city has to offer, you are paying a price also because the city is more polluted and crowded. Unless new technology emerges and we can drive cars that will convert fuels into steam during combustion and only clean air comes out of the exhaust pipe, in the near future, the air pollution casue by automobile exhausts will get worse as people have more cars and the roads get more jammed.
