第2题: [单项选择]Passage Two Questions 30 to 32 are based on the passage you have just heard. A. Many students try to study the whole night before an exam. B. Sleep may improve memory. C. Exams may harm memory. D. Sleep can improve listening ability. 参考答案:B 答案解析:[听力原文]30-32 Many students try to study the whole night and do not sleep before an exam. Two s