lsat-22-4-11

11.   Unless the residents of Glen Hills band together, the proposal to rezone that city will be approved. If it is, the city will be able to build the water and sewer systems that developers need in order to construct apartment houses there. These buildings would attract new residents, and the increased population would probably result in overcrowded schools and would certainly result in roads so congested that new roads would be built. Neither new roads nor additional schools could be built without substantial tax increases for the residents of Glen Hills. Ultimately this growth might even destroy the rural atmosphere that makes Glen Hills so attractive.

Which one of the following can be properly concluded from the passage?

(A) If the citizens of Glen Hills band together, developers will not build apartment houses.

(B) If developers build apartment houses in Glen Hills, there will be substantial tax increases for the residents of Glen Hills.

(C) If the rezoning proposal does not pass, the rural atmosphere in Glen Hills will not be lost.

(D) If developers do not build apartment houses in Glen Hills, the taxes of the residents of Glen Hills will not increase substantially.（B）

(E) If developers do not build apartment houses in Glen Hills, the schools of Glen Hills will not be overcrowded and roads will not be congested.

想问一下第一句：unless the residents band together, the proposal will be approved. 是不是等同于：if the proposal is not appoved, then the resident band together.

其它充分必要指示词见连接

http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=73506

果然是好贴！我费了好大劲也没能总结得这么全，感谢lawyer

另外谈一下我对特例的理解：

1、the only way to achieve success is to work hard.  achieve success(充分条件)

既然only是充分条件指示词，那么这个句子的必要条件就是work hard，因为它是only后面work hard的同位语，不算特例

2、only a professional consultant can solve the organization’s problems. a professional consultant(必要条件)

这句是标准的必要条件指示词，怎会是特例？

3、no citizen can be denied the right to vote. denied the right to vote(充分条件). no citizen(必要条件)

no是必要条件指示词，也不算特例呀？