limn→∞1-an+11+an-1=limn→∞1an-a1an+1a=-a1a=-a2．
隋炀帝开凿大运河的目的是( )
A．为了加强南北交通
B．为了去扬州看琼花
C．为了消灭南方的陈王朝
D．为了巩固隋王朝对全国的统治
Will all those ____ the proposal raise their hands? [ ]
A. in relation to
B. in excess of
C. in contrast to
D. in favour of
