—Excuse me, how can I get to the South Hill?

— Oh, ________ of these buses will take you there, you can only take a taxi.

A．all

B．both

C．none

D．nothing

苹果iPhone4（16GB）手机标价4999元，小张最终花4900元购得，4900元在这里执行的职能是（）

A.价值尺度

B.流通手段

C.贮藏手段

D.支付手段