题干
-- How are you feeling here?
-- It's quite hot. I don't know to go or stay.
A：how
B：when
C：whether
D：what
答案(点此获取答案解析）
C
-- How are you feeling here?
-- It's quite hot. I don't know to go or stay.
A：how
B：when
C：whether
D：what
为最小正周期的偶函数，且在
上为减函数的是 （ ）
