利率平价学说从( )角度来探讨汇率，考察利率对汇率的影响。
A．国际资本流动
B．商品交易
C．投资交易
D．国际贸易
参考答案：A
--Did you visited the military museum?
--Yes. Not until quite recently ________ any idea what a guided missile was like.
A．had I have
B．did I have
C．I had
D．I have had
当量孔隙
