英语选词填空propelscontainwayscomplicatedmixturescaleworseburnedupMytopictodayis“TheCarandAirPollution“.Inparticular,Iwantfirstlytodi

Question

英语选词填空
propels           contain           ways              complicatedmixture             scale             worse             burned up                My topic today is “ The Car and Air Pollution “.In particular,I want firstly to discuss the ___1___in which the car causes air pollution; and secondly,how we can control or reduce air pollution from the car.          First,then,how does the car cause air pollution?What happens is that the car’s internal combustion engine is a kind of chemical factory on a small___2___.It uses a ___3___of petrol and air,and this mixture explodes and burns,to produce the energy which ___4___the car.But while this is happening,many ___5___chemical reactions are taking place.In particular,part of the petrol-air mixture is not completely___6___,and so the exhaust gases from the engine ___7___some very dangerous chemicals,such as carbon monoxide,nitrogen oxides,lead and hydrocarbons.          This is situation,then,and it’s going to get much___8___,unless we do something about it.

Answer 1

1 ways,根据后文中的how,可知这里填的是方式ways
2 scale 汽车的内燃机(combustion engine)是小规模的化学工厂,由文意可知
3 mixture 由下一句可知
4 propels 这个单词的意思是驱动,燃烧混合物释放能量,驱动汽车
5 complicated 燃烧是复杂的化学反应
6 burned up 有后文排出的气体中有碳氢化合物hydrocarbons,可知是混合物没有燃烧完全
7 contain 产生污染是因为排出的气体含有有害物质
8 worse 不采取行动,情况将变得更糟