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题型：单选题 题类：常考题 难易度：普通
（新版）人教新目标版七年级英语下册 Unit 3 How do you get to school单元测试
一Yes，they will．
—Yes. They can take harmful gases and provide us ______ oxygen.
—No, I often go to school ________ bus. My home is far from school.
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