____ (do) Ken win the race yesterday?
圆C的圆心在y轴正半轴上,且与x轴相切,被双曲线x2-y23=1的渐近线截得的弦长为3,则圆C的方程为( )
____is my brother,____name is Tony. Look! Those model planes are____. ( he )
下列有关我国河流的叙述,正确的是( )