阅读理解
My day in different schools!
the USA
8:00am
9:00am
9:30am
5:00pm
7:30pm
China
7:00am
7:30am
8:40am
3:50pm
6:00pm
Canada
8:30am
10:00am
Spain
9:30pm
下列属于动物先天性行为的是( )
已知双曲线x2cos2θ-y2sin2θ=1(π2<θ<π)的右焦点为F,P是右支上任意一点,以P为圆心,PF长为半径的圆在右准线上截得的弦长恰好等于PF,则θ的值为( )