C网软交换VPN，承载C网语音的信令和媒体信息，为（）连接。
A.网状
B.全网状
C.星型
D.环型
参考答案：B
______ provided the methodological foundation for materials for the teaching and its principles formed the basis of such widely used series as English 900 and Success With English.
A．The Direct Method
B．The Oral Approach
C．The Audiolingual Method
D．The Communicative Approach
