— Shall we play basketball this afternoon? 

— _____ I need to exercise very much. [ ]

A. Why not?

B. I agree with him.

C. You are lucky.

D. No, I don't want to.

施工单位应当（）设置各项临时设施。堆放大宗材料、成品、半成品和机具设备，不得侵占场内道路及安全防护等设施。

A.按照施工总平面布置图

B.根据施工便利

C.根据经济合理的原则

D.根据建设单位的要求