题目内容：
According to the National School Lunch Act，school lunches must comply with government-developed dietary guidelines． 参考答案：
答案解析：
单选题：According to the National School Lunch Act，school lunches m
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One problem for students to replace traditional textbooks w
One problem for students to replace traditional textbooks with interactive digi
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.