A. cannot hear sounds clearly B. are poor at remembering and understanding what they have learned C. are poor at learning things by what they have heard D. have the habit of learning things by what they have heard of 参考答案:C 答案解析:[解析] 文章第二段第二句是依据: “这是因为他没有运用听力来帮助记忆和理解所学知识。”