题干
——Do you mind my smoking here?
——_________, Look at the sign. It says, “No Smoking.”
A：It doesn't matter.
B：No, I don't.
C：You'd better not.
D：Never mind.
答案(点此获取答案解析）
C
，则函数
的零点个数为 ( )
B. 
C. 
E. 
