填空题

The third stage of NREM is the time when you dream.

【参考答案】

N
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填空题
This passage is mainly about the dreams and sleeping problems that we may have during sleep.
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1. 给你的朋友John写一封信,说明由于你的疏忽把他借给你的书弄丢了你给他买了一本新的; 2. 表示真诚歉意; 3. 主动提出赔偿。 A letter of Apology
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