16. He had () on the subject.

　　A. a rather strong opinion B. rather strong opinion

　　B. rather the strong opinion D. the rather strong opinion (A)

　　rather+贬义形容词;fairly+褒义形容词;名词前排序：冠词+描绘词+特征词

　　17. He knows little of mathematics, and () of chemistry.

　　A. even more B. still less C. no less D. still more (B)

　　still less 更少 little的比较级 less，最高级least

　　18. A fter having gone () far, Tom did not want to turn back.

　　A. enough B. much C. such D. that (D)

　　enough不能置前 that =so 那么

　　19. That heart is () intelligent that the stomach, for they are both controlled by the brain.

　　A. not so B. not much C. much more D. no more (D)

　　no more 不再。。。 no more…than… 与其说。。。毋宁说。。。

　　20. Do you enjoy listening to records? I find records are often () of better than an actual performance.

　　A. as good as B. as good C. good D. good as (A)

　　as good as 同级比较; be better than不同级比较