已知抛物线x²=4y的焦点为F，A、B是该抛物线上的两动点，且
，过A，B两点分别作抛物线的切线，设两切线相交于点C，求△ABC面积的最小值．

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问答题一项由甲、乙等5个人参加的相互传球游戏，第一次由甲将球传出，每次传球时，传球者将球等可能地传给另外4人中的任何一人，经过n次传球后，球在甲手中的概率为Pn．请写出Pn的递推关系式，并求Pn.

单项选择题A: I’m going shopping.B: Do you mind if I come with youA: (). You can carry my bag for me.

A. Thank you
B. It’s my pleasure
C. By the way
D. No, of course not
E. Never mind

单项选择题该处选项为（）。

A．This tour is the chance of lifetime．
B．It goes all over North America and South America．
C．It looks like you’re dreaming about something．
D．You’ll have to quit school and your job at the store．
E．My agent wants me to go on a tour with Art’s Jazz Band．
F．Have you told anyone about this yet
G．It would be a great opportunity!

问答题