历代帝王在泰山的（）地方筑坛祭天？
A.泰山玉皇顶西北
B.泰山玉皇顶东北
C.泰山玉皇顶东南
参考答案：A
( )比较适合大型复杂系统的转换。
A．直接转换
B．并行转换
C．分段转换
D．以上都不是
In order to buy a big apartment, he tried to ____some of his salary. [ ]
A. leave out
B. set aside
C. build up
D. figure out
