I have got two tickets ______ tomorrow's evening show. Would you like to come with me?
A:in
B:by
C:from
D:for
Who is the____(smart)boy in your class?
下列地理事物作为澳门标志的是( )
(I)求出动点P的轨迹对应曲线C的标准方程;
(Ⅱ)一条纵截距为2的直线 l1 与曲线C交于P,Q两点,若以PQ直径的圆恰过原点,求出直线方程.