Now, of course this doesn't mean that not smoking or drinking, and playing sports can guarantee happiness.It could be that kids who have happy character tend to be more active and less addicted to drinking or smoking.And it could equally be the case that kids who are unhappy are more related to drinking, smoking and eating junk food.

　　Other studies have shown that exercise is a proven way to treat anxiety and depression.Future studies may support the idea that other healthy behaviors, including refraining (克制) from smoking,

　　【语篇解读】 研究

　　25．The author develops the second paragraph mainly by________．

　　C．offering examples

　　D．analyzing causes

　　答案　A　A。]

　　A．Not smoking or drinking guarantees happiness.

　　B．Teens with flooding hormones cannot be happy.

　　C．Playing sports can decrease teens' unhappiness.

　　D．Unhappiness can certainly lead to smoking and drinking.

　　答案　C　[推理判断题。根据文章最后一段的第一句“其他研究表明锻炼是一个经证实了的治疗焦虑和沮丧的方法”可推知运动可以降低青少年的不幸福指数。]

　　A．Ways to treat anxiety and depression

　　B．Exercise and teenagers' health

　　C．Teenagers shouldn't drink or smoke

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