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：
单选题：One problem for students to replace traditional textbooks w
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听录音,{MP3:http://wximg.233.com/attached/media/20150602/201506
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what would happen at meal time if you remembered eating a l
what would happen at meal time if you remembered eating a lot in the previous m
The sharing economy has a promising future.
The sharing economy has a promising future.
The most frequently shared items are those expensive to buy
The most frequently shared items are those expensive to buy but not fully used.
第(39)题应填__________
第(39)题应填__________