【題目】—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：——據(jù)說(shuō)PM2.5污染是如今大氣污染的主要問(wèn)題。——而且我也知道根據(jù)研究北京的大霧日數(shù)正在減少。

考查介詞短語(yǔ)。根據(jù)第二空的固定搭配according to可知第二空填介詞to，故排除B、D選項(xiàng)；in表示所屬范疇；with帶有，表示伴隨的狀態(tài)，根據(jù)“PM2.5 pollution”和“air pollution” 及常識(shí)可知PM2.5污染是大氣污染的一種，而且是大氣污染的主要問(wèn)題。所以第一空填in。故選A。

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