As we all know，fresh air is to our health and the new park us all，so we should keep it clean.(benefit)

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1. As we all know，fresh air is to our health and the new park us all，so we should keep it clean.(benefit)

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高中英语人教版（新课程标准）2017-2018学年高二下册选修七Unit 1 Living well同步练习2