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案例分析题All living things need air to live. People need clean air to breathe. But sometimes people make the air dirty. They drive so many cars that the fumes from the cars pollute the air.Fumes are made when gasoline is burned. The fumes that come out of cars, buses and trucks can pollute the air.Environmental engineers are people who work to protect the environment. One of their jobs is to design or plan cars that will not pollute the air. Some time ago environmental engineers designed an object for cars that removes harmful pollution. Now cars are causing less pollution than they once did, because environmental engineers worked hard to protect the environment. （）has cleaner air.
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My brother often learns English （）the radio.
论述题 情景： 你的英国朋友Frank发来邮件询问你的近况。你想告诉他一件让你感到高兴的事情。 任务： 请你用英语给他写一封50个词左右的电子邮件。告诉他： (1)事情发生的时间、地点； (2)事情的具体经过。 请用下面格式：Dear Frank, ___________________ ___________________Yours Sincerely,Li Min
案例分析题All living things need air to live. People need clean air to breathe. But sometimes people make the air dirty. They drive so many cars that the fumes from the cars pollute the air.Fumes are made when gasoline is burned. The fumes that come out of cars, buses and trucks can pollute the air.Environmental engineers are people who work to protect the environment. One of their jobs is to design or plan cars that will not pollute the air. Some time ago environmental engineers designed an object for cars that removes harmful pollution. Now cars are causing less pollution than they once did, because environmental engineers worked hard to protect the environment. All living things need air （）.
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