Question

13．A．sick B．over C．turned into D．referred to E．disaster

The first reported event of this kind in the United States happened in Donora，a factory town in a valley near Pittsburgh．In 1948，a killer smog made half of the population （50）A，there were 17deaths．Again，older people with lung or heart diseases were hit hardest．
London，England，has always been known for its"black fogs"．In the winter of 1952，a milky white fog rolled into the city．It soon （51）Cblack smog as the smoke of the city poured into the air．It was so hard to see that people had to walk in front of the buses to guide them．In this way，the most serious air pollution （52）Ein history began．When it was
（53）B，more than 4，000people had been killed by the thick black smog．

Answer 1

分析 文章大意：本文讲述了美国一个工厂的浓烟排出造成了17人死亡，一半的人患病，同时还提到了伦敦的"黑烟"造成了非常严重的空气污染，4000多人因此死亡．

解答 50．A 考查形容词与对语境的理解．由下文说17人死亡和older people with lung or heart diseases were hit hardest可知此处表示烟雾致使一半的人口生病了，选A表示生病的．
51．C 考查对语境的理解．结合语境可知此处表示白烟变成了黑烟，选择C，turn into表示变成．
52．E 考查名词与对语境的理解．由下文说的4000多人因此而死亡可知，此处表示历史上最严重的空气污染灾难开始的，选E表示灾难．
53．B 考查对语境的理解．结合语境可知此处表示当这次浓烟事件结束后，4000多人因此而死亡了，选B表示结束．

点评 选词填空类题首先需要了解所给词语的意思与用法，再通读文章，了解文章大意，结合文章的语境来选择正确的词语．