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Water is good for everything in your body.

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So make sure to have it with you at all times and try to drink 8 glasses a day.

Also who knows maybe your smile might make somebody’s day.

You must make a choice to take a chance or your life will never change.

观看第一课时知识点，你认为：各能级最多容纳的电子数为以s、p、d、f……排序的自然数1、3、5、7……的2倍是否正确？

A. 对
B. 错