My son is more careful with his lessons than before and makes ________ mistakes in his exercises.
A.fewer
B.more
C.little
D.much
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A解析思路分析：该题考查根据语境选择适当的形容词．在进行比较时形容词要用比较级．根据My son is more careful with his lessons than before的语境，既然做功课比以前细心，做练习出的错误自然就比以前少．形容词few表示“不多的”、“少的”，修饰复数可数名词，其比较级形式是fewer．