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题型：单选题 题类：常考题 难易度：容易
牛津版（深圳•广州）2018-2019学年初中英语七年级下册Module 4 Unit 7第2课时Reading(2)
一 No. Can you show me ?
—Many scientists are working hard to find them. But there's still no good news.
—Yes, we often write letters to each other.
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