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题型：单选题 题类：常考题 难易度：普通
牛津上海(本地版)五四制初中英语八年级上册Module 2 Unit 4 Numbers单元测试卷（音频暂未更新）
—We have finished _______of it.
—Yes. The gravity on Mars is only about {#blank#}1{#/blank#} of that on the Earth.
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