中兴基站CBTSI2每块TRX能支持（）个载频的应用。
A.1
B.2
C.3
D.4
参考答案：D
Most children need encouragement in time of failure _____ they can cheer up again.
A．in case
B．so that
C．because
D．if
若市场利率为12%，现值指数为( )。
A．1.24
B．1.34
C．1.44
D．1.54
