故事《老苏尔坦》中,老苏尔坦的老朋友是一只()。
A、狼
B、乌鸦
C、黑熊
参考答案:A
Tom worked very hard, ______ that he would be able to buy a car of his own in two years.
A.hoped
B.to hope
C.hoping
D.and hoping
简述西蒙的决策理论包含的内容。