Jim knows little of mathematics,____ of chemistry.

Jim knows little of mathematics,____ of chemistry.
A.and still less B.as well as C.no less than D.and still more
为什么答案是A不是B

A.Jim 对数学知之甚少,对化学就更不懂了.less是little的比较级,“更少”；still在句中意为：“...得多”用来修饰比较的.and后面承前少了主语和谓语：Jim knows little of mathematics,and he knows still less of chemistry.
B这个答案有很大的干扰性.用B的话,要把of去掉,as well as 连接两个学科名词作宾语.
Jim knows little of mathematics as well as chemistry.吉姆不但化学差,而且对数学也知之甚少.

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