In case of emergency, whether knowing how to apply first aid or not really in matters concerning wounds like swollen wrists, broken arms, burns, cuts, and so on.
A. makes difference
B. makes a difference
C. makes differences
D. makes different
网友回答
A. makes difference
(答案→)B. makes a difference
C. makes differences
D. makes different
解析：句意：在紧急情况下，是否懂得紧急施救在某些事上有很大的影响，象手腕肿胀、胳膊断了、烧伤以及砍伤等等。make a difference有影响，有关系。根据句意故选B。