As the saying goes, ______. So take it easy and read the question slowly within then given time when you take the test. [ ]

A. truth is the daughter of time.          

B. no man is wise at all time.

C. easier said than done.                

D. more haste, less speed.

人类的祖先原本过着生吞活剥、茹毛饮血的原始生活，后来才发明了烹调。烹起源于（）的利用。