46. What does the passage say about open educational resources?
- A. They contribute to teaching as much as to learning.
- B. They don't profit as much as traditional textbooks do.
- C. They can't connect professors and students as textbooks do.
- D. They compete fiercely for customers with textbook producers.
答案：C
答案句：Textbook publishers connect professors, instructors and students in ways that alternatives, such as open e-textbooks and open educational resources, simply do not.
参考译文：教科书出版商以开放电子教科书和开放教育资源等替代品根本无法做到的方式将教授、讲师和学生联系起来。
定位线索：题干“open educational resources”→答案句“open educational resources”；文中“connect professors, instructors and students”对应选项C“connect professors and students”；文中“alternatives...simply do not”对应选项C“can't”。
解析：题干问开放教育资源的情况，答案句明确指出教科书出版商连接教授、讲师和学生的方式是开放教育资源等替代品做不到的，因此选项C正确。选项A无中生有，文中未提及教学与学习的贡献；选项B偷换概念，文中未比较利润；选项D无中生有，未提及竞争。
47. What is the main cause of the publishers' losses?
- A. Failure to meet student need.
- B. Industry restructuring.
- C. Emergence of e-books.
- D. Falling sales.
答案：D
答案句：It is true that textbook publishers have recently reported losses, largely due to students renting or buying used print textbooks.
参考译文：教科书出版商最近确实报告了亏损，这主要是由于学生租用或购买二手印刷教科书。
定位线索：题干“main cause of the publishers' losses”→答案句“losses, largely due to”；文中“students renting or buying used print textbooks”对应选项D“Falling sales”（二手书和租赁导致新书销量下降）。
解析：题干问出版商亏损的主要原因，答案句明确指出亏损主要由于学生租用或购买二手印刷教科书，这导致新书销量下降，因此选项D正确。选项A无中生有，未提及学生需求；选项B答非所问，行业重组是结果而非原因；选项C无中生有，未提及电子书。
48. What does the textbook industry need to do?
- A. Reform its structures.
- B. Cut its retail prices.
- C. Find replacements for printed textbooks.
- D. Change its business strategy periodically.
答案：A
答案句：A restructuring of the textbook industry may well be in order.
参考译文：教科书行业的结构重组很可能是有必要的。
定位线索：题干“textbook industry need to do”→答案句“A restructuring of the textbook industry”；文中“restructuring”对应选项A“Reform its structures”。
解析：题干问教科书行业需要做什么，答案句明确指出行业重组是有必要的，因此选项A正确。选项B无中生有，未提及降价；选项C无中生有，未提及替代品；选项D偷换概念，文中未提及商业策略。