单选题：One problem for students to replace traditional textbooks w

题目内容：

One problem for students to replace traditional textbooks with interactive digital ones is the high cost of the hardware．

参考答案：

答案解析：

听录音,{MP3:http://wximg.233.com/attached/media/20150602/201506

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分类：英语四级题型：单选题

what would happen at meal time if you remembered eating a lot in the previous m

分类：英语四级题型：单选题

分类：英语四级题型：单选题

The most frequently shared items are those expensive to buy but not fully used.

分类：英语四级题型：单选题

分类：英语四级题型：单选题