下列说法正确的是( )
- Alan, don't ________ too late, or you will feel sleepy in class.
- Sorry, Mrs. Black. I won't do that again.
已知函数f(x)满足f(x+1)=1f(x),且f(x)是偶函数,当x∈0,1时,f(x)=x2,若在区间-1,3内,函数g(x)=f(x)-kx-k有4个零点,则实数k的取值范围是( )