题目

阅读短文，根据语篇要求填空，使短文通顺/意思完整。每空限填一词。 Do you like taking a nap after lunch? It can make you feel relaxed  refreshed for the afternoon. Be careful, though. Napping for too long can backfire. Scientists say that a power nap should only be about 20 to 25 . If you sleep longer than this, you'll fall  a deeper sleep cycle. It lasts for about 90 minutes. If your alarm wakes you up during this deep sleep cycle, you will feel very tired. Also, take a nap too late in the day, at 3 or 4 pm. Having snacks before a main meal, it just cut down your "hunger" for sleep  night. Word Bank: refreshed 精力充沛的 backfire   适得其反 答案：【1】and【2】minutes【3】into【4】don't【5】at

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