金属探测门应配有声音报警信号调节设置，可以调节持续时间，（）和音量。
A.音色
B.音调
C.报警时间
D.间断时间
参考答案：B
.
Though an active politician, she succeeded in balancing the _______ she played both at home and in society.
A．characters
B．parts
C．performances
D．activities
Since the shipment consists of seasonable goods, it is important that it is ________as soon as possible.
A．deleted
B．demanded
C．delivered
D．detached
