第27题: [单项选择]Questions 19 to 22 are based on the conversation you have just heard. A. The early history of bookbinding. B. How old books become valuable. C. Economical ways to protect old books. D. Why some books decay. 参考答案:D 答案解析:[听力原文] 19-22 W: Excuse me, I’ve been using this old bookfor a research project and I notic
第28题: [单项选择]要约在()时生效。 A. 发出 B. 受要约人看到 C. 到达受要约人 D. 受要约人承诺 参考答案:C