Schools that serve healthier food, offer nutrition education and reward students for good eating habits can make a major in preventing childhood obesity.
A. mistake
B. sense
C. impression
D. difference
网友回答
A. mistake
B. sense
C. impression
(答案→)D. difference
解析：本题考查名词。make a difference 有区别，有影响，起作用。根据句意选D。