A successful scientist needs if he wants to make hypothesis (假设) of how processes work and how events take place.
A. permission
B. penetration
C. imagination
D. convention
网友回答
A. permission
B. penetration
(答案→)C. imagination
D. convention
解析： imagination 想象力；penetration 穿透；permission 允许; convention 惯例，常规。