下列( )不是按专业性质分类的预算定额。
A．建筑工程预算定额B．市政工程预算定额C．铁路工程预算定额D．行业统一定额
参考答案：D
— Look! Everything here is under construction.
— Oh, it has the museum once_________for exhibitng art works been pulled down,too. [ ]
A. being built
B. been built
C. having been built
D. built
读经纬网图，回答下列各题。
若飞机从图中B点飞往D点，沿最短航线飞行，合理的方向是（）
A.一直向东
B.一直向西
C.向东南→东→东北
D.向西南→西→西北
