查了所有的讨论帖，都没看出个所以然的语法题？不知哪位高人可指点？-->leonchan转移

1. Not all employment selection mechanisms that have a “disparate effect,” that is, that screens out a percentage of minorities or women disproportionate to their presence in the relevant labor market, are unlawful.
(A) that is, that screens out a percentage of minorities or women disproportionate to
(B) which means, that screens out a percentage of minorities or women disproportionate with
(C) which means, that screen out a percentage of minorities or women disproportionate with
(D) that is, that screen out a percentage of minorities or women disproportionate to
(E) that is, that screens out a percentage of minorities or women disproportionate with

答案是D, 明白了在这题里that is 比which means 好，可是不明白为什么不选A，就是说为什么为要有用SCREEN，它是谁的谓语？

这个我看得比较好的一个讨论帖：http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=29978

但是最后也没总结出为什么

谢谢牛人进来指点，静候答案

15.The increased popularity and availability of televisions has led to the decline of regional dialects, language variations which originate from diverse ethnic and cultural heritages and perpetuated by geographic isolation.
(A) which originate from diverse ethnic and cultural heritages and perpetuated
(B) that originated from diverse ethnic and cultural heritages and perpetuated
(C) originated from diverse ethnic and cultural heritages and perpetuated
(D) originating from diverse ethnic and cultural heritages and perpetuated
(E) originating from diverse ethnic and cultural heritages and perpetuating

也顺便请教一下，为什么选D? a 错在哪里呢？还有c的错误？ 谢谢

这个区是走出GMAT困境，是给大家讨论综合的方法问题的。具体题目在其他各个区讨论。

请楼主在标题里面给出题目出处，方便大家回帖，方便后人查询，谢谢啊

另外，多个题目，恳请一题一贴，才能方便讨论！

各个区的发贴规范：

GMAT机经＋MATH讨论
http://forum.chasedream.com/dispbbs.asp?boardID=22&ID=128922

GMAT语法区版规
http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=79830

GMAT逻辑区格式和搜索
http://forum.chasedream.com/dispbbs.asp?boardID=24&ID=74827

GMAT阅读区-发贴格式和搜索提示
http://forum.chasedream.com/dispbbs.asp?boardID=25&ID=41017

GMAT AWA区版规
http://forum.chasedream.com/dispbbs.asp?boardID=26&ID=107312

方便自己，方便他人，感谢您的理解和支持！