Peter’s jacket looked just the same as Jack’s，but it cost______his.

A．as much twice as

B．twice as much as

C．much as twice as

D．as twice much as

关于货币职能，下面说法正确的是（）

A.充当价值尺度的货币可以是货币符号

B.充当流通手段的货币可以是观念上的货币

C.充当储藏手段的货币必须是真实且足值的货币

D.价值尺度和储藏手段是货币的基础职能