题目

广缘超市一天营业了多长时间? 答案：【答案】解：12时－8时＋8时30分＝12时30分答：广缘超市一天营业了12时30分。【解析】17．With the（ 61）development（develop） of industry，air pollution is getting more and more serious．In Beijing，many people suffer different kinds of illnesses because （62）ofair pollution．Air pollution is caused by the following（63）reasons（reason）：about half of the problem is caused by vehicles．There are more and more cars，buses on the roads，and they give off （64）poisonous（poison） gases.25% of air pollution is caused by factories．Another factor is the smokers．Smoking is（65）harmful（harm）to their health．Besides these，about 10%of air pollution is caused by other reasons．（66）SoWe should do now is take some measures to fight（67）againstpollution．New fuel can be used to take （68）theplace of gas．We can plant more trees．If everybody realizes the（69）importance（important） of environment and does something to stop pollution，the problem will（70）be solved（solve）．