听第7段材料,回答题。 Where does this conversation take place?

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根据下面选项回答题:A.慢蠕动 B.紧张性收缩C.分节运动 D.容受性舒张E.集团蠕动小肠特有的运动形式是

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Susan:I'm so glad to see you, David.56 has been such a long

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第50题应填__________

第50题应填__________A.Without B.Using C.Not being used D.With

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