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  3. All living things need air to live. People need clean air to breathe. But sometimes people make the air dirty. They drive so man

All living things need air to live. People need clean air to breathe. But sometimes people make the air dirty. They drive so man

admin2009-09-17  54
问题 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.
选项 A、to grow
B、to produce fruits
C、to breathe
答案C
解析 空气是生物生存的必要条件，但非充分条件，因此A不准确，B显然不对，C为“用来呼吸”，为正确答案。
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