题目内容
19．It is said thatair pollution is more and more serious in some cities．（空气污染）分析 据说在有些城市，空气污染越来越严重了．
解答 答案：air pollution．
根据所给汉语提示结合语境推测句意是"据说在有些城市，空气污染越来越严重了．"，此处根据设空处短语在句子中作主语判断用名词"污染"，短语"空气污染"是air pollution，所以答案是：air pollution
点评 做这类题型，首先根据所给汉语明确句子所要考查的单词或短语的拼写，再结合相关语法知识对单词或短语做出形式上的变化．
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