题干
— ___________ ___________ is it?
— It's 15 yuan.
A：How much
B：How many
C：How far
答案(点此获取答案解析）
A
— ___________ ___________ is it?
— It's 15 yuan.
A：How much
B：How many
C：How far
是定义在区间
上的奇函数，
的最大值与最小值之和为