New York City has had several London-type smogs since 1950. Each time, there were from 100 to 400 deaths caused by the smog. Although these smogs were not as deadly as London’s, New York City has the worst air pollution problem in the United States.
16.According to the scientists, people in the Meuse valley died or became ill because_____.
A. factories poured smoke and fumes into the foggy air B. the smog lasted for four days
C the elements in the smog were poisonous
D they were old and had heart and lung problems
17. The word “ailment” in line 3 paragraph 2 probably means______.
A disaster B problem C cancer D deficiency 18. The smogs in London _____. A have been famous for long
B are not as deadly as that in New York City C can reach as far as New York City D cause people to be blind
19. From the passage we can know that Donara______. A. had the first killer smog in the U.S.
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