discriminate/distinguish between... and...与...from A and B的区别？

LZM中也有提到过，但是，我发现有时候做题还是不对。

我的理解是：distinguish between A and B，那么A和B是不重叠的，互相对立，没有交集的事物

distinguish A from B，则A应该是B的一个子集，将其从中区别出来。

各位是这样理解的吗？这样对马？

请参考大全60.

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

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。