皮皮学，免费搜题
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【简答题】
听短文，根据短文内容选择正确答案。 1. How much should one pay to borrow books in Britain? A. $8. B. $4. C. None. 2. How long can one keep books? A. 5 weeks. B. 4 weeks. C. 3 weeks. 3. What books are always in great demand (需求最大)? A. Science books. B. History books. C. New novels. 4. How can you know the book you want is ready to pick up? A. By calling. B. By postcard. C. By e-mail. 5. What is the passage about? A. Libraries in America. B. Libraries in Britain. C. Novels in Britain.
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知识点：
皮皮学刷刷变学霸
举一反三
【多选题】芽孢抵抗力强的原因可能是
A.
具多层致密的厚膜，理化因素不易透入
B.
含水少，蛋白质受热不易变性
C.
含高浓度镁盐，与酶结合而获得对热的抗性
D.
含耐热的核糖核酸酶