The passage mainly tells us ______. According to the results of the study from Yale University and Johns Hopkins University, we

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问题 The passage mainly tells us ______.
According to the results of the study from Yale University and Johns Hopkins University, weknow that ______.

选项 A、95 American cities contain 40% of the national population
B、children are easy to suffer from an increase in ozone
C、a small increase in ozone can cause higher death rates
D、the study placed the time between 1987 and 2000

答案C

解析 本题属细节题,从第三段的句子“The research suggests that even a small increase in ozone,10 parts per thousand million,can lead to higher death rates the following week”可知C选项正确。
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