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sCiEntists hAvE long known thAt slEEp,

scientists have long known that sleep, 科学家们早就知道睡眠,

1B 2D 3C 4B

1. one quarter 2. No, they do not. 3. Too much dreaming is bad for our health. 4. People often have dreams at night, but they cannot remember them clearly. If people had been thinking something all day, toughts would carry over...

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