—  Do you think that housing price will keep ____ in the years to come?

— Sorry, I have no idea. [ ]

A. lifting up

B. going up

C. bringing up

D. growing up

根据区位经济分析和区位地租理论而构成的“杜能圈”中的第四圈为( )。

A．林业区
B．草田轮作区
C．谷物轮作区
D．自由农作区