请教 og12 sc 136 ， 谢谢！！！

attractg

136.［ｕ］Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes［/ｕ］ form a random pattern.

(A) Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes
(B) Whereas the tiny tubes for the conveying of nutrients to bone cells are arrayed in mammals in parallel lines, birds have tubes that
(C) Unlike mammals, where the tiny tubes for conveying nutrients to bone cells are arrayed in parallel lines, birds’ tubes
(D) Unlike mammals, in whom the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, the tubes in birds
(E) Unlike the tiny tubes that convey nutrients to bone cells, which in mammals are arrayed in parallel lines, in birds the tubes

答案是A, 不明白C, C 是unlike A, B do 的形式，unlike后面解释了where the tiny tubes...  为什么比较对象还是不对等呢？  unlike 要怎样才可以对等？ unlike 和 whereas 在用法上的区别是什么？能不能具体讲下，非常感谢！！！

还想问下，有没有关于比较类的题目详细的总结~~？ 谢谢大家了！！！

houhaibo528

(C) Unlike mammals, where the tiny tubes for conveying nutrients to bone cells are arrayed in parallel lines, birds’ tubes
应该是mammals和birds相对应，或者mammal's tubes和birds' tubes相对应。
whereas是个连词，然而 但是的意思，后面加一个完整的句子
unlike是个介词，不像，和...不同，后面加名词性质的元素，形成介宾结果

136.［ｕ］Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes［/ｕ］ form a random pattern.

(A) Whereas in mammals the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, in birds the tubes
(B) Whereas the tiny tubes for the conveying of nutrients to bone cells are arrayed in mammals in parallel lines, birds have tubes that
(C) Unlike mammals, where the tiny tubes for conveying nutrients to bone cells are arrayed in parallel lines, birds’ tubes
(D) Unlike mammals, in whom the tiny tubes that convey nutrients to bone cells are arrayed in parallel lines, the tubes in birds
(E) Unlike the tiny tubes that convey nutrients to bone cells, which in mammals are arrayed in parallel lines, in birds the tubes

答案是A, 不明白C, C 是unlike A, B do 的形式，unlike后面解释了where the tiny tubes...  为什么比较对象还是不对等呢？  unlike 要怎样才可以对等？ unlike 和 whereas 在用法上的区别是什么？能不能具体讲下，非常感谢！！！

还想问下，有没有关于比较类的题目详细的总结~~？ 谢谢大家了！！！

-- by 会员 attractg (2011/9/13 22:51:14)

attractg

谢谢解答，讲得很清楚，明白啦~~！！！非常感谢~

200814005

大全中所有比较题
http://forum.chasedream.com/GMAT_SC/thread-36523-1-1.html

一个NN的总结：
http://forum.chasedream.com/GMAT_SC/thread-103101-1-1.html?userid=-1&extparms=ThreadCatalogID%3d62%26page%3d1

trackofheart

Idiom; Rhetorical construction; Parallelism
Whereas introduces two contrasting situations or events and should be followed by parallel structures. In this sentence, whereas is immediately followed by a clause beginning with the prepositional phrase in mammals; this means that the second part of the sentence must also be a clause that opens with a preposition that functions in the same way—in this case, in birds. ?is structure clarifies that the things being contrasted are the tubes in mammals and the tubes in birds. Incorrect versions of the sentence grammatically contrast tubes and birds, mammals and tubes, or birds and mammals.
A    Correct. Parallel structures make clear that the tubes in mammals are being contrasted with the tubes in birds.
B    the faulty parallelism results in a sentence that is confusing and unnecessarily wordy.
C    the sentence compares mammals and birds’ tubes.
D    Because of faulty parallelism, this sentence also compares mammals and tubes in birds.
E    theis structure is wordy and confusing because of faulty parallelism.



上面是136的解答，我想问。og里面的上面有idiom。。但是下面的分析却没有提到，这个idiom在哪里啊？？？？

trackofheart

顶顶啊。。求解。。