题干
— Tom, who taught Chinese before you came to China?
— Nobody. I learned it by .
A：your; myself
B：his; himself
C：you; myself
D：him; himself
答案(点此获取答案解析）
C
， 
， 
是此椭圆上的一点，且 
， 
，则该椭圆的方程是( )