—How do you like the project put forward by the Smiths?

—Considering its real ______, it will be well worth putting into practice, I think.

A．price

B．value

C．cost

D．expense

由于在整条微波电路上各微波站的收发信频率交替出现并以高站和低站呈有规律的（）。

A.相间排列

B.相同排列

C.分组排列