OG6
In virtually all types of tissue in every animal species, dioxin induces the production of enzymes that are the organism’s trying to metabolize, or render harmless, the chemical that is irritating it.
(A) trying to metabolize, or render harmless, the chemical that is irritating it
(B) trying that it metabolize, or render harmless, the. chemical irritant
(C) attempt to try to metabolize, or render harmless, such a chemical irritant
(D) attempt to try and metabolize, or render harmless, the chemical irritating it（E）
(E) attempt to metabolize, or render harmless, the chemical irritant
！OG 说
The phrase the chemical irritant is also the most concise and precise conclusion for the sentence because it clearly refers to the dioxin mentioned earlier.（这不明白！！！the chemical irritant 怎么REFER dioxin ）呢！
SORRY 啊！我在别的人的帖子里接恢复老是发不出去 试了一个晚上了 只能发新的了 麻烦了大家了！
OGQ15
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
字典distinguish 有2种搭配：distinguish ... from /distinguish (between)...and...但是看了OG解释后我发现ETS 只承认 distinguish between ...and ...
OG 说：The best choice is C because it uses the idiomatically correct expression distinguishes between x and y
The other choices use distinguishes in unidiomatic constructions.
我这种感觉对吗？？ | 
