A:浩浩荡荡地向南流入印度洋
B:默默地流入北冰洋
C:滚滚向东流入太平洋
D:从中部呈放射状流向周围的海洋
—________your brother speak French?
—Yes, he has learnt it in Paris for three years.
已知x+2y=4k2x+y=2k+1,且-1<x-y<0,则k的取值范围为