—Dad, must I do my homework now?

—No. You_____play games with your friends for a little while.

A．would 　　

B．needn’t

C．may

D．don’t have to

兰科植物按其生长习性分类中属于附生兰的是（）

A.剑兰

B.兜兰

C.春兰

D.惠兰