从经济学的角度看，下列属于投资的是( )。
A．购建厂房
B．购买证券
C．购买土地
D．购买股票
参考答案：A
His brother ________ Shanghai. Now he is in Kunming. [ ]
A. go to
B. has been to
C. went to
D. has gone to
城市政策
