—I would like to buy an expensive camera.

—Well, we have several models________.

A．to choose from

B．to choose

C．to be chosen

D．for choice

由工程费用、工程建设其他费用、预备费构成的是（　　）估算。

A．财务效益

B．建设投资

C．运营成本

D．建设期利息与流动资金