—What do you think of the project put forward by the Blacks?

—Considering its real ________，it will be well worth putting into practice，I suppose.

A．reward

B．prize

C．cost

D．value

电话传输系统中，具有抗干扰能力强、保密性高及电路集成化等优点的是（）。

A.模拟传输

B.数字传输

C.无线传输

D.有线传输