问题详情：
With the 61 (develop) of industry, air pollution is getting more and more serious. In Beijing, many people suffer different kinds of illnesses because 62 air pollution. Air pollution is caused by the 63 (follow ) reasons: about half of the problem is caused by vehicles. There are more and more cars, buses on the roads, and they give off 64 (poison) gases. 25% of air pollution is caused by factories. Another factor is the smokers. Smoking not only does harm to their health but to others. 65 these, about 10% of air pollution is caused by other reasons. We 66 take some measures to fight 67 pollution. New fuel can be used to take 68 place of gas. We can also plant more trees. If everybody realizes the 69 (important) of environment and does something to stop pollution, the problem will 70 (solve).
【回答】
lopment 63. following 64．poisonous des
ld/must nst rtance solved
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