–You should be careful when you take the chemistry exam.--I agree. In this way I will m

问题补充：

–You should be careful when you take the chemistry exam.

--I agree. In this way, I will make mistakes.

A. more; less

B. more; more

C. more; fewer

D. less; fewer

答案：

A. more; less

B. more; more

(答案→)C. more; fewer

D. less; fewer

解析：句意：当你考化学的时候，你应该仔细些。我同意，就这样我会犯较少的错。less是little的比较级，little修饰不可数名词，故less修饰不可数名词，fewer是few的比较级，few修饰可数名词，故fewer修饰可数名词，mistakes是可数名词，故选C。