几道SC！！求助！

ZYC1122

•        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

Answer：D

想请问一下that is是修饰disparate effect吗，which means不可以修饰吗？那后面的that screen out 是修饰mechanisms？如何判断的？

2.No less an authority than Walter Cronkite has reported that half of all Americans never read a book.

(A) No less an authority than

(B) Nonetheless an authority

(C) Nevertheless authoritarian

(D) Not less an authority than

(E) An authority not less than

Answer：A

Emmm这个没怎么懂...

3.New techniques in thermal-scanning photography, a process that records radiation from surface areas, makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before.

(A) makes it possible to study the effects of calefaction, or warming, of a river in greater detail than ever before

(B) make it possible to study, in greater detail, the effects of calefaction, or warming, of a river than ever before

(C) have made it possible to study in greater detail than ever before the effects of calefaction, or warming, of a river

(D) make possible the study of the effects of calefaction, or warming, of a river in greater detail than it ever was before

(E) has made it more possible than ever before to study in greater detail the effects of calefaction, or warming, of a river

Answer：C

想请教下这里为什么要用have done的时态？还有怎么分析下这个句子？

感恩不尽！！

ZYC1122

10287 发表于 2018-6-23 02:22
说一下我自己的理解哇，不一定很对，仅仅是一个小参考哦～第一题肯定是不能用which的，因为在GMAT里，which ...

那怎么看是补充对象呀？

10287

说一下我自己的理解哇，不一定很对，仅仅是一个小参考哦～第一题肯定是不能用which的，因为在GMAT里，which专门指代前一个单词（99%的情况），如果你选which，那就是effect means that screen out blahblahblah，显然是没有道理的。整体来看，这句句子的结构是这样的：Not all mechanisms are unlawful。中间的that have…effect是修饰mechanism，这个很明显，后面一个that screen out…其实是一个补充修饰，对象还是mechanisms，至于两者中间的that is就类似于一个连接词～