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题型：单选题 题类：常考题 难易度：普通
外研版初中英语九年级下册Module 3 Unit 2同步练习
— A one way ticket ________ $40, and you can ________ another $20 for a roundtrip.
—Once a month.
—Yes. They can ________ harmful gases from the air.
— Because they give me ____________ pressure.
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