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题型：单选题 题类：常考题 难易度：普通
冀教版初中英语八年级下册Unit 3 Lesson 16 The Pear Escaped 同步练习
—Let's go and join them.
— ___________ 364899176.
—It's about three kilometres.
—Yes. They can take harmful gases and provide us ______ oxygen.
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