求助，天山真题一道，关于discriminatate的用法

1.     After a few weeks’ experience, apprentice jewelers can usually begin to discriminate, though not with absolute certainty, genuine diamonds from imitation diamonds.

(A) genuine diamonds from imitation diamonds

(B) genuine diamonds apart from imitations

(C) between genuine diamonds and imitation diamonds

(D) among genuine diamonds and imitation diamonds（C）

(E) whether diamonds are imitation or genuine

答案选C

我想知道A和C的区别，discriminatate A from B和discriminatate between A and B在语法上都是正确的呀

嘿嘿，只能说gmat rules了

貌似gmat特别偏爱平行

个人观点，两个的确都对.但GMAT里可能真有偏好吧?

1. 你没有大全解释吗?或者，你得学会在CD上搜索别人的讨论啊,不能一遇到问题就发帖子.你认为呢?

2. 当然如果你看了讨论仍然不清楚，再发帖子也没什么.

参见大全382.

A中though not with absolute certainty插入语的位置不好, 通常插入语不应该在动词和名词之间，用带介词的between…and…比较好, 避免了这种问题。

此外，discriminate between…and…的范围比discriminate…from…广。后者只能之比较的两物是完全对立的。

genuine diamonds和imitation diamonds，不是等同相反的两个概念：真的应对假的，而imitation只能认为是假的一种。似乎ETS更喜欢discriminate between…and…

Longman 中的解释

discriminate between: to recognize a difference between things.

Eg: It is sometimes difficult to discriminate between edible and poisonous mushrooms.

discriminate sth .from

eg. You must learn to discriminate fact from opinion.

A test is useful for discriminating those students who have reached a higher level from those at a lower.

The parties have become so similar it is difficult to discriminate Republicans from Democrats.

the process of learning to discriminate fact from opinion

Small children can't distinguish right from wrong

谢谢牛刀杀小，不过我下载的大全只有答案，没有解释呀。能否发个链接下载有解释的大全？

抱歉，我还真的不知道怎么在论坛上搜索别人的帖子。能否指点一下？