—What are they doing over there?

—They're getting ready ______ the party. [ ]

A. to 　　　

B. on 　　　

C. about 　　　

D. for

劳动强度指数是通过下列哪项求得（）。

A.劳动工时测定

B.能量代谢测定

C.调查

D.公式计算

E.以上都是