题目内容
One student not only failed, but lost 12 pounds.
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It is easy for those who are unaffected by the powerful draw of connectivity - those who can easily control their time online - to view Internet addiction as an imaginary problem or to attribute its origins to a weak personality.
The Internet is a powerful tool, but make sure that you use it wisely for all the good value it offers and that you won't let too much of a good thing become something bad.
海水之所以是咸的（含盐量很高）是因为：
关于水对热的稳定性：
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