求助：请问这道逻辑狗，下面的原题选哪项？

sdcar2010

I concur.  

-- by 会员 sdcar2010 (2011/3/11 9:23:16)

其实，据我的理解，意思就是说如果将A选项的women和men的区别改为 people，那么A就不能选了吧。A正确的理由是不是就是提供了另一个"C“呢，即是women cause both volunteer and longevity？
请大牛指点

-- by 会员 shuangjiangamy (2011/3/11 9:36:00)

I can't agree more.

心诚则灵的MM

提干说做VOLUNTEER会释放endorphins，从而增加well-being,最后有助于LONGEVITY，所以认为VOLUNTEER是longevity的充分条件。为了反驳这个论点，即volunteer不能完全推导出longevity，那么只要切断regular release of endorphins 与 people’s longevity之间的联系就可以。即便不断释放endorphins，longevity仍然无法保证。要达到这个目的，四个选项里面只有C看似在讨论两者的联系。选项A我认为完全排除了题干的主题，即不管有没有释放那个物质，长寿仅和男女性别有关。

所以我选C。。。。欢迎来拍我。

sdcar2010

LS, pay attension to the last sentence : that statistic would be what we would expect EVEN IF volunteering does not boost longevity, . . .

If C is right, you still need a reason to back up the results of the statistic.

rooneyfang

I think the answer is A

the question asks you to seek an ASSUMPTION  "because ...". assumption is unstated premise. moreover, this is a causal reasoning. Therefore, you should find a premise best suit the effect. Let's analyse the Effect step by step.
"that statistic would be what we would expect even if volunteering does not boost longevity"  is in subjunctive mood.CONDITION is "volunteering does not boost longevity". RESULT is "statistic would be what we would expect".
 I think the key is to distinguish between " the statistic" and " what we would expect"
"the statistic" is "adults who regularly engage in volunteer work helping others shows that they live longer, on average, than adults who do not volunteer"
"what we would expect" is the conclusion draw from "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". Thus, the conclusion is the same as the result of the statistic. "people engage in activities that help others live longer"
 We can think the Effect as a whole. " people engage in activities that help others live longer"

The best way to understand the Effect is seeing the main point of the subjunctive mood as modifying " what we would expect"

 Answer A suits the best.

 B has nothing to do with what is discussed.
 C,D,E Out of the scope.