ISDN是（）
A、非对称数字用户线路
B、电缆调制解调器
C、综合业务数字网络
D、移动电话系统
参考答案：C
— Did you hear that Jim quarreled with his wife?
— I didn't, and________about it.
A. nor don't I care
B. nor do I care
C. I don't care neither
D. I don't care also
如图，表示在空中飞行的足球，质量为420g，画出它所受重力的示意图．
