逻辑请教之2

harvard2012

1.  a beach has long had a dolphins feeding program where foods are given to dolphins several times a day; the dolphins get as much as half of their food each day there. while dolphins that first benefit from the program as adults are strong adn long-lived, their offspring have a shorter life expectancy than offspring of dolphins that feed only in the wild.
(d) many dolphins that feed at the beach with their offspring come to the beach only a few times a month.
(e) adult dolphins that feed at the beach spend much less time teaching their offspring how to catch fish in the wild than do other adult dolphins
正确答案是D，我觉得E也没错啊

2 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 oplates, 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 usually engage in volunteer work helping others indicates that they live longer, on average, than adults who do not volunteer. but thease statistic would be what we would expect even though volunteering does not boost longevity, since (                                                               ).
(a) in the communitites studied, women were much more likely to do regular volunteer work than men were, and women tend to llive longer than men do
(b) the number of young adults who do regular volunteer work is on the increase
正确答案是A，为啥啊，我选的B啊