The passage mainly tells us ______. [br] According to the passage, we can infer

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问题 The passage mainly tells us ______. [br] According to the passage, we can infer that ______.

选项 A、the present ozone level in America is safe to people
B、there is no direct connection between ozone and death rates
C、the study of ozone and death rates has been done several times
D、America has a worse problem with ozone than other countries

答案 C

解析 从第四段的第一句话“The study is one of the largest ever done of ozone and death rates”可以看出,关于臭氧和死亡率关系的研究已经进行过好多次。可知C选项正确。
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