ISDN通常用户接口是PRI或________。
A．比特率接
B．基本速率接口
C．字节速率接口
D．宽速率接口
参考答案：B
埃及绝大部分国土在非洲[ ]
A、西北部
B、东北部
C、东南部
D、西南部
Linda's parents ______ for nearly fifteen years. [ ]
A. married
B. have married
C. have been married
D. got married
