Ⅱ度营养不良儿童，腹泻迁延不愈，其脱水多为（）

A.等渗性脱水

B.低渗性脱水

C.高渗性脱水

D.低钙血症

E.高钾血症

Many people expect that credit cards will eventually______ paper money for almost every purchase.

A. trade                  B. replace              exchange         D. reduce