Now, of course this doesn't mean that not smoking or drinking, and playing sports guarantees 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 and 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 healthful behavior, including refraining (克制) from smoking, drinking, and eating too much junk, can avoid sadness and increase happiness, too.

　　5．The author developed the second paragraph mainly by ________.

　　A．making comparisons

　　B．providing statistics

　　C．offering examples

　　D．analyzing causes

　　解析：选A　推理判断题。根据文章第二段的例子“... six times more likely to ...”和“... were five times less likely to ...”可知，第二段主要用了对比的说明方法。A“对比”；B“提供数据”；C“举例子”；D“分析原因”。故答案选A。

　　6．What can we learn from the text?

　　A．Not smoking or drinking guarantees happiness.

　　B．Teens with flooding hormones can not be happy.

　　C．Playing sports can decrease teen's unhappiness.

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