数学： 8个人，其中包括A和B两个人，从中选出4个人组成一个committee，A要在这4人里面但B不能在里面，问概率是多少？ 数学个人经验是如果在第34或35题出现概率题，就肯定有50分。我模考4次和今天实战都是这样的。 逻辑：（GWD上出现过的，一摸一样，考前一天刚做过，嘿嘿） Which of the following most logically completes the argument?? When people engage in activities that help others ,their brain releases endorphins, the brain’s natural opiates, which induce in people a feeling of well-being. It has been suggested that regular release of endorphins increases people’s longevity. And a statistic on adults who regularly engage in volunteer work helping others shows that they live longer, on average, than adults who do not volunteer. How- ever, that statistic would be what we would expect even if volunteering does not boost longevity, because . A. in the communities studied, women were much more likely to do regular volunteer work than men were, and women tend to live longer than men do. B. the number of young adults who do regular volunteer work is on the increase C. the feelings of well-being induced by endorphins can, at least for a time, mask the symptoms of various conditions and diseases, provided the symptoms are mild. D. it is rare for a person to keep up a regular schedule of volunteer work through- out his or her life. E. Some people find that keeping a commitment to do regular volunteer work becomes a source of stress in their lives. | 
