社会网络（SNS）所基于的主要理论是（）
A.网络理论
B.长尾理论
C."六度分隔"理论
D.人际关系理论
参考答案：C
---- I’m too nervous to give a talk in front of so many people.
---- __________, Maria. You can do it.
A．Come on
B．With pleasure
C．That’s true
D．You’re right
—What ______ fruit do you like?
—Bananas. [ ]
A. kind
B. kind of
C. a kind of
D. a kind
