英语每日一句口语阅读
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英语美文篇一 Evolution of Sleep 睡眠的进化 Sleep is very ancient. In the electroencephalographic sense we share it with all the primates and almost all the other mammals and birds: it may extend back as far as the reptiles. 睡眠自古就有。从脑电图上看,我们人类和所有灵长目动物...