Question

【题目】air, the, clean,cool,trees,keep, can,and（.）

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Answer 1

【答案】Trees can keep the air clean and cool.

【解析】

句意：树木可以保持空气的清洁和凉爽。

短语keep sth. adj.：保持某物是什么样子的；结合句意可知答案为“Trees can keep the air clean and cool.”。注意句子的开头，首字母大写。