构成社区的基本要素不包括
A.生活方式
B.一定的地域范围
C.相对不固定的人群
D.必需生活服务设施
E.特定的文化背景
参考答案:C
已知等比数列{an}中,a1=1,a2=2,则数列{log2an}的前n项和为______.
The new stadium(体育场) being built for the next Asian Games(亚运会) will be ________ the present(现在的) one.
A.as three times big as
B.three times as big as
C.as big as three times
D.as big three times as