投资者以客户的证券作为抵押，贷款给客户购进股票，这种保证金交易模式体现了投资银行的（）中介功能。
A.期限
B.流动性
C.风险
D.信息
参考答案：B
---Seems no one knows _____ what happened to Malaysia Airline Flight 370.
---It’s really sad, hope more and more resources will be offered in the search.
A．exactly
B．especially
C．hardly
D．quickly
_____ is necessary for us to tell him about the result.
A．That
B．This
C．It
D．What
