某块土地在利用中所用资本和劳动的变量投入成本与其收益相等的点正是该宗地的( )。

A．集约边际
B．粗放边际
C．无租边际
D．增租边际

 He will go to the mountains with his parents if it       next Sunday.

A． won’t rain

B． doesn’t rain

C． isn’t rain

D． will rain