A:What's this?
B:What's that?
下图为亚洲三个人类文明发祥地,这三个地区的共同特征是( )
There are seven ______ in the picture.
已知椭圆x23m2+y25n2=1和双曲线x22m2-y23n2=1有公共焦点,那么双曲线的渐近线方程为( )