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答案：
E
题目说family
-size燕麦比regular-size含有更多盎司燕麦也更贵，问family-sized每盎司多少钱。
条件一family-size 的燕麦比regular的多了10盎司的燕麦。没办法仅仅从这个条件知道family-size到底有多少，也没法知道单价。 不充分
条件二 family-size 燕麦5.4， 但是不知道它多重，没法知道单价。不充分
一和二联立 还是无法求出 所以选E 
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