High levels of PM2.5mainly causes the air pollution in China．The air pollution in Chinaismainlycausedby high levels of PM2.5．题目和参考答案——青夏教育精英家教网—

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3．High levels of PM2.5mainly causes the air pollution in China．（改为被动语态）
The air pollution in Chinaismainlycausedby high levels of PM2.5．

分析 PM2.5指数高在中国主要引起大气污染．
中国的大气污染主要是由PM2.5指数高引起的．

解答答案：is，caused．原句是一般现在时的主动语态，下文的主语是the air pollution是动词cause引起的承受者，构成被动关系，故用一般现在时的被动语态am/is/are+过去分词，主语是不可数名词，故用is，cause的过去式是caused，故答案是is，caused．

点评一般现在时的被动语态am/is/are+过去分词的呈现，各种类型的被动语态的构成要理解掌握．

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