下列菜肴中，属于川菜代表菜的是（）。
A.爆双脆
B.宫爆鸡丁
C.水煮肉片
D.樟菜鸭子
参考答案：B
设Sn为等比数列{an}的前n项和,已知3S3=a4-2,3S2=a3-2,则公比q等于( )
A．3
B．4
C．5
D．6
— Are you familiar(熟悉) with the music?
— Yes. There was ______ time _____ this kind of music was quite popular. [ ]
A. a, that
B. a, when
C. the, which
D. the, when
