第3题: [单项选择]从装满1000克浓度为50%的酒精瓶中倒出200克酒精，再倒入蒸馏水将瓶加满。这样反复三次后，瓶中的酒精浓度是多少( ) A. 22.5% B. 24.4% C. 25.6% D. 27.5% 参考答案:C 答案解析:[解析] 第一次稀释后，酒精浓度为(1000-200)×50%÷1000=40%；第二次稀释后，酒精浓度为(1000-200)×40%÷1000=32%；第三次稀释后，酒精浓度为(1000-200)×
第5题: [单项选择]在恒定干燥条件下干燥某湿物料，湿物料处理量为5kg/m2，干基含水量0.5，已知物料的临界含水量为0.15kg水/(kg绝干料)，平衡含水量为0.02kg水/(kg绝干料)，恒速段干燥速率为1.8kg/m2·h，降速段干燥速率与物料干基含水量呈线性关系，则将物料含水量降至0.05所需要的时间最接近(
)。 A. (A) 1.25h B. (B) 0.972h C. (C) 1.502h D. (D) 0.530h 参考答案:C
第18题: [简答题]Directions: You are a teacher of English. The editor of Campus News asked you to recommend two English books for students to read during the summer. Your article should include: 1) brief introductions to the books; and 2) reasons for your recommendation. 参考答案:
Good books are interesting and enlightening. They keep US motivated to read, offering wisdom and pleasure. Good books are easy to read. They do not pose too many difficulties, otherwise we might never finish reading them. The following books are highly recommended.
Alice’s Adventures in Wonderland tells an interesting story. It is fun reading it also because the author is playing with the English words in a humorous way. Around the World in H0 Days shows the behaviors of a decent English gentleman at times of crisis. It presents the customs of various countries in the AI th century，too.
