在广州长兴里万木草堂开设“群学”的是
A．康有为
B．梁启超
C．章太炎
D．谭嗣同
参考答案：A
已知等差数列{an}的前n项和为Sn，若a4=18﹣a5，则S8=[ ]
A．72
B．68
C．54
D．90
--I'm not finished with my dinner yet.
--But our friends__________for us.
A．will wait
B．wait
C．have waited
D．are waiting
