It is easy to do the repair, _____ you need is a hammer and some nails. [ ]

A. something

B. all

C. both

D. everything

我国的《政府采购法》明确规定，政府采购实行（）的方法。

A.集中采购 

B.分散采购 

C.集中采购与分散采购相结合 

D.灵活多样