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题型：单选题 题类：常考题 难易度：容易
2016年新目标英语中考知能综合检测十三：八年级下册 Units 7、8
—That's really bad. We should save trees and plant more trees.
—Many scientists are working hard to find them. But there's still no good news.
—I also want to have a penfriend.
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