Question

【题目】Some students are so ______ that they often make mistakes in their homework.

A. carful B. serious C. careless D. successful

Answer 1

【答案】C

【解析】词义辨析。careful仔细的；serious严重的；careless 粗心的；successful成功的。根据句意：他们做作业经常犯错误，应该是粗心才会引起错误的。故选C。