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题型：单选题 题类：常考题 难易度：普通
鲁教版（五四制）七年级上册Unit 6 How often do you exercise? Period 1 Section A (1a-2d) 同步练习
-- Yes. But now the people here are trying hard to make the air become better and _____.
— So it's convenient. I can go __________ to buy things with the card.
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