当想询问喜欢夏天原因是,你应该说:
A:I like playing sports.
B:Why do you like summer?
C:Which season do you like best?
D:I like winter best.
China is a fantastic place and I have only____ ____ ____ ____ I saw.
如图,椭圆E:x2a2+y2b2=1(a>b>0)的离心率是22,过点P(0,1)的动直线l与椭圆相交于A,B两点,当直线l平行与x轴时,直线l被椭圆E截得的线段长为22.