lawyer总结里面说assumption题型：
“条件型结论：结论带条件（即为充分必要）。ASSUMPTION的方法排除充分条件出现，必要条件不出现的情况。或充分条件一定能推出必要条件，或排除充分条件推不出必要条件的可能”
什么是“充分条件出现，必要条件不出现的情况”，麻烦哪位前辈可以举个例子给我讲讲？
A mail order company recently had a big jump in clothing sales after hiring a copywriter and a graphic artist to give its clothing catalog a magazine like format designed to appeal to a more upscale clientele. The company is now planning to launch a housewares catalog using the same concept. The company's plan assumes that:
(A) other housewares catalogs with magazinelike formats do not already exist
(B) an upscale clientele would be interested in a houseware catalog
(C) the same copywriter and graphic artist could be employed for both the clothing and housewares catalogs
(D) a magazinelike format requires a copywriter and a graphic artist
(E) customers to whom the old clothing catalog appealed would continue to make purchases from catalogs with the new format
其中C选项充分条件出现，但是必要条件未出现。
76. A famous singer recently won a lawsuit against an advertising firm for using another singer in a commercial to evoke the famous singer’s well-known rendition of a certain song. As a result of the lawsuit, advertising firms will stop using imitators in commercials. Therefore, advertising costs will rise, since famous singers’ services cost more than those of their imitators.
The conclusion above is based on which of the following assumptions?
(A) Most people are unable to distinguish a famous singer’s rendition of a song from a good imitator’s rendition of the same song.
(B) Commercials using famous singers are usually more effective than commercials using imitators of famous singers.
(C) The original versions of some well-known songs are unavailable for use in commercials.
(D) Advertising firms will continue to use imitators to mimic the physical mannerisms of famous singers.
E
(E) The advertising industry will use well-known renditions of songs in commercials.
答案是E
结论是 因果型的，你把since改成if就是条件型，assumption还是不变，依然要排除掉广告商不用著名歌手的演唱曲目的可能性
A mail order company recently had a big jump in clothing sales after hiring a copywriter and a graphic artist to give its clothing catalog a magazine like format designed to appeal to a more upscale clientele. The company is now planning to launch a housewares catalog using the same concept. The company's plan assumes that:
(A) other housewares catalogs with magazinelike formats do not already exist
(B) an upscale clientele would be interested in a houseware catalog
(C) the same copywriter and graphic artist could be employed for both the clothing and housewares catalogs
(D) a magazinelike format requires a copywriter and a graphic artist
(E) customers to whom the old clothing catalog appealed would continue to make purchases from catalogs with the new format
其中C选项充分条件出现，但是必要条件未出现。
那是不是可以这么理解，充分条件是the same copywriter and graphic artist ，以及高消费阶层对houseware cataloge的兴趣？
by the way，要把C选项的必要条件补充完整的和话应该是什么呢
还请指教？
应该是充分条件和必要条件的概念没搞清吧
http://forum.chasedream.com/dispbbs.asp?BoardID=24&ID=61430看完这个问题就会解决了
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