Help？LSAT Section5-II-7

bigmouse

7. Those who participate in local politics include people who are genuinely interested in public service and people who are selfish opportunists. Everyone who participates in local politics has an influence on the community’s values.
If the statements above are true, which one of the following must also be true?
(A) Some selfish opportunists have an influence on the community’s values.
(B) Some persons who are interested in public service do not have an influence on the community’s values.
(C) All those who have an influence on the community’s values participate in local politics.
(D) Some of those who influence the community’s values neither are interested in public service nor are selfish opportunists.
(E) All those who have an influence on the community’s values are either interested in public service or are selfish opportunists.
answer:A my choice:E

vrylwj

E 的充分和必要关系不对。是选A。

因为所有参会的人都有影响，而参会的有真正关心的，也有自私的。所以有一些自私的人有影响。

bigmouse

谢谢！