精选优质文档-倾情为你奉上全国新课标高考英语语法填空专项训练语法填空练习一 With the 1_ (develop) of industry, air pollution is getting more and more serious. In Beijing, many people suffer different kinds of illnesses because 2_ air pollution. Air pollution is caused by the following 3_(reason): about half of the problem is caused by vehicles. There are more and more cars, buses on the roads, and they give off 4_ (poison) gases. 25% of air pollution is caused by factories. Another factor is
