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题型：单选题 题类：常考题 难易度：容易
新目标版英语八年级下册 Unit 9 Have you ever been to a museum？（Section B）
—Wonderful！________of the land________ covered with trees and grass.
— About of the students made such a choice? Life is far more important, isn't it?
—Yes. The gravity on Mars is only about {#blank#}1{#/blank#} of that on the Earth.
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