题干
— _______ will you stay there?
— For two days.
A：How long
B：What time
C：How often
D：When
答案(点此获取答案解析）
A
— _______ will you stay there?
— For two days.
A：How long
B：What time
C：How often
D：When
时，取得最大值2；当x＝
时，取得最小值－2，那么函数的解析式为( )