语法大全中一道题求解，死活都想不明白。。求大神指教！

ptlove4ever

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

(A) genuinediamonds from imitation diamonds
(B) genuinediamonds apart from imitations
(C) betweengenuine diamonds and imitation diamonds
(D) among genuinediamonds and imitation diamonds（C）
(E) whetherdiamonds are imitation or genuine

答案给的是C，可是为什么A不对啊。在词典上查discriminate的用法，这两种用法都是有的。。。死活想不明白`求大神指教了。。。谢谢啦~~~

coloryao

本人菜鸟，说说自己的看法，望大牛指导
此处discriminate是区别的意思，也就是在天然和人工里区别，而不是从人工里区别天然，楼主你在仔细看看吧，所以选C

ptlove4ever

明白了~~~谢谢啦！有时候就是一根弯绕不出去。哈哈~