目前，语音信息在电话网上进行长距离传输采用的是数字形式的语音信号，其取样频率为8kHz，量化精度为8位，每秒钟的数据量(未压缩时)大约是

A．64kB

B．32kB

C．128kB

D．8kB

Even though they have worked side by side in the same office for 9 years, the two ladies ______ on good terms.

A．are not

B．were not

C．have not been

D．will not be