第21题: [单项选择]Questions 11 to 18 are based on the conversation you have just heard. A. The man should sleep for a while. B. The man should finish the job right now. C. The man should try to concentrate on the job. D. The man should get some exercises. 参考答案:D 答案解析:[听力原文] M: So tedious a job! I can’t concentrate on it any longer. Maybe we should take a nap befo