对土霉素耐药金葡菌有效：
A．四环素B．多西环素C．二者均是D．二者均否
参考答案：B
Only when you stay and live with___ local people for a period of time will you have
____better understanding of life here.
A．a;/
B．the;a
C．/;the
D．the;the
（）是通信网信息传输的途径。
A、结点
B、链路
C、交换设备
D、传输设备
