A:congratulatio
B:better luck next time
C:best wishe
D:take your time
—The song is very beautiful. It makes me .
—Oh, I don't like that style.
已知函数f(x)是定义在R上的偶函数,当x≥0时,f(x)=x2﹣2x,如果函数g(x)=f(x)﹣m(m∈R) 恰有4个零点,则m的取值范围是____