2. 外语
  3. A、cost more than digital texts B、cost less than digital texts C、are not good sources of textbooks D、are also good sources of tex

A、cost more than digital texts B、cost less than digital texts C、are not good sources of textbooks D、are also good sources of tex

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问题
选项 A、cost more than digital texts
B、cost less than digital texts
C、are not good sources of textbooks
D、are also good sources of textbooks
答案D
解析 第5段第1句为本段的主题句，表明本段接下来的内容要说明为什么学生无需再外购教材了，最后一句也是原因之一，其中的not to mention意为“更不用说……”，这表明除了e-books之外，book rental services和hand-me-downs都是获得教材的很好的来源，选D。
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