大众英语80篇背诵阅读带翻译(四十) "80 Evolution and Wheels In the past, evolutionary biologists contemplating the absence of wheels in nature agreed that the explanation was not undesirability:... /
2010-06-08 / 查看
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胡敏练白话记英语六级单词:H字头 A: I think we have an obligation to protect our natural habitat . B: I agree. That is why I promote recycling. habitat n.(动物的)栖息地,住处 A: How di... /
2010-06-08 / 查看
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大众英语80篇背诵阅读带翻译(二十) "40 Cohesion-tension Theory Atmospheric pressure can support a column of water up to 10 meters high. But plants can move water much higher; the sequoia tree ca... /
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