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英语听力文摘 English Digest 506、跷跷板的乐趣

Remember seesaws? Those things were great. But there was often a problem. Suppose theres a big kid on one side and a smaller kid on the other side. The seesaw just stays in one position: big kid on the ground, smaller kid up in the air. No fun. After

发表于:2019-01-26 / 阅读(54) / 评论(0) 分类 英语听力文摘 English Digest
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