第20题: [单项选择]What will the man do A. Leave and find his own seat. B. Keep sitting in that seat. C. Let the woman sit next to him. 参考答案:A 答案解析:[听力原文] F: I’m sorry... but... that’s my seat. M: Oh, sorry, I made a mistake.
[名师解析] 对话
第21题: [单项选择]下列因素与原发性肝癌的发病可能有关 A. 病毒性肝炎 B. 肝硬化 C. 黄曲霉素 D. 饮用水污染 E. 以上都是 参考答案:E