全向天线要安装在制高点，避雷针和天线水平距离至少（）米
A.5
B.1
C.2
D.2.5
参考答案：A
已知a∈R，则“a＞2”是“a2＞2a”成立的( )
A．充分不必要条件
B．必要不充分条件
C．充要条件
D．既不充分也不必要条件
In spite of the song's popularity, the band ________ it from their new album as they failed to find one
who would sing it well enough. [ ]
A. deleted
B. concluded
C. kept
D. included
