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    【题目】Air pollution is ________ most Chinese people are concerned about nowadays, because their health is being threatened.

    A.thatB.why

    C.whatD.how

    【答案】C

    【解析】

    考查表语从句。句意：空气污染是现在大多数中国人关心的问题，因为他们的健康正受到威胁。此处be动词后面是表语从句，从句缺少引导词，谓语动词短语are concerned about缺少宾语，所以所填词要起双重作用，应填what，故选C。

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