识别客户的方法包括（）
A.普遍识别法
B.广告识别法
C.介绍识别法
D.委托助手识别法
参考答案：A, B, C, D
---May I use your cellphone?
---_____. We are good freinds
A．No trouble at all.
B．Of course you may
C．You are welcome
D．It all depends
--- does she do on weekends?
--- She usually helps her mother.
A．Where
B．Who
C．When
D．What
