“或为辽东帽,清操厉冰雪。”“或为渡江楫,慷慨吞胡羯。”说的是哪两个人的典故?()
A.管宁、祖逖
B.祖逖、张巡
C.张巡、段秀实
D.段秀实、管宁
参考答案:A
—It is ridiculous (荒唐的) that so many people believe the world will disappear in 2012.
—__________ it is true?
A.So what
B.What for
C.What if
D.What’s up
简述黄金期权的定义。