Knowing how to give first aid really in case of emergency. It can save lives.
A. makes difference
B. has a difference
C. makes a difference
D. makes the difference
网友回答
A. makes difference
B. has a difference
(答案→)C. makes a difference
D. makes the difference
解析：考查固定短语。make a difference“有影响，有关系”。句意“为防止紧急情况的出现，了解怎样急救确实很重要。它能拯救生命。”故选C。