下列事件中，属于不确定事件的有 ①太阳从西边升起； ②任意摸

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问题选择题

下列事件中，属于不确定事件的有

①太阳从西边升起； ②任意摸一张 * * 票会中奖；

③掷一枚硬币，有国徽的一面朝下； ④小明长大后成为一名宇航员 [ ]

A．①②④

B．②③④

C．①③④

D．①②③

答案

答案：B

单项选择题

Speaker A: I'd like to buy a copy of Professor Franklin's book on shells.Speaker B: ______

A．Are you one of Professor Franklin's students

B．But I like his book on fish better than that on shells.

C．I'm sorry, sir. That book has been out of print for some time now.

D．Will you pay over there at the cashier

名词解释

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