实物量法和定额单价法在编制施工图预算的主要区别在于（）不同。

A.直接工程费计算过程

B.依据的定额

C.工程量的计算规则

D.确定利润的方法

—We'll have a hiking trip, but when shall we meet?

—Let's make it ______ half past eight ______ the morning of June 21. [ ]

A. at; in

B. /; on

C. /; in

D. about; by