诗有三境
参考答案：
物境（诗由物生）、情境（诗由情生）、意境（揭示思想与事理）。
[2013·石家庄质检]已知等差数列{an}满足a2＝3，Sn－Sn－3＝51(n>3)，Sn＝100，则n的值为( )
A．8
B．9
C．10
D．11
By the end of last week 611 people from 49 countries _______ to attend the meeting, with
nearly half from the United States, Germany and Britain. [ ]
A. had registered
B. have registered
C. registered
D. were registered
