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    【题目】—It’s reported that PM2.5 pollution is the main problem ________ air pollution today.

    — And I also know according________ the research the number of ‘foggy’ days in Beijing is reducing.

    A.in, toB.by, inC.with, toD.at, at

    【答案】A

    【解析】

    句意：——据说PM2.5污染是如今大气污染的主要问题。——而且我也知道根据研究北京的大雾日数正在减少。

    考查介词短语。根据第二空的固定搭配according to可知第二空填介词to，故排除B、D选项；in表示所属范畴；with带有，表示伴随的状态，根据“PM2.5 pollution”和“air pollution” 及常识可知PM2.5污染是大气污染的一种，而且是大气污染的主要问题。所以第一空填in。故选A。

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