OG-15 In his research paper, Dr. Frosh, medical director of the Payne Whitney Clinic, distinguishes mood swings, which may be violent without their being grounded in mental disease, from genuine manic-depressive psychosis.
(A) mood swings, which may be violent without their being grounded in mental disease, from genuine manic-depressive psychosis
(B) mood swings, perhaps violent without being grounded in mental disease, and genuine manic-depressive psychosis
(C) between mood swings, which may be violent without being grounded in mental disease, and genuine manic-depressive psychosis
(D) between mood swings, perhaps violent without being grounded in mental disease, from genuine manic-depressive psychosis（C）
(E) genuine manic-depressive psychosis and mood swings, which may be violent without being grounded in mental disease
OG 解释为：
The best choice is C because it uses the idiomatically correct expression distinguishes between x and y and because it provides a structure in which the relative clause beginning which may be violent clearly modifies mood swings. The other choices use distinguishes in unidiomatic constructions. Additionally, their in A is intrusive and unnecessary, and the modifier of mood swings in B and D (perhaps violent) is awkward and less clear than the more developed clause which may be violent.
我查了一下字典，感觉distinguich between---and---与distinguish from没有什么区别，而选项A与选项C只有distinguich between---and---与distinguish from的差别，说明用distinguish from在这里肯定错。想不明白啊！
再如
Although many art patrons can readily differentiate a good debenture from an undesirable one, they are much less expert in distinguishing good paintings and poor ones, authentic art and fakes.
(A) much less expert in distinguishing good paintings and poor ones, authentic art and
(B) far less expert in distinguishing good paintings from poor ones, authentic art from
(C) much less expert when it comes to distinguishing good paintings and poor ones, authentic art from
(D) far less expert in distinguishing good paintings and poor ones, authentic art and（B）
(E) far less the expert when it comes to distinguishing between good painting, poor ones, authentic art, and
OG 解释：
The best answer will follow the idiomatic form distinguishing X from Y. The substitution of and for from makes choices A, C, D, and E faulty. Moreover, far is a better modifier of less expert than much is in A and C, when it comes to distinguishing is wordy in C and E, and E fails to acknowledge that two distinctions are being considered – one between good and poor paintings, another between authentic art and fakes. B is the correct answer or this question of middle difficulty.
两道题中的OG解释互相矛盾！请NN帮忙看看
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