题干
. The main fact(or)s in human life are five: birth, food, sleep, love and death. (One could increase the number— add breathing for instance— but these five are the most obvious.) Let us ask ourselves ________ our lives.
A：they play in what part
B：they play what part i
C：what part they play i
D：in what part they play
答案(点此获取答案解析）
C
，
，
，则汽车在这三处因遇红灯而停车一次的概率为（ ）
