A：how can I get to your school
B：how much it costs to get to your school
C：how far it is from your home to your school
D：how long does it take me to get to your school
下列行为属于自卑的是（ ）
函数f（x）=log22x﹣log2x2，则函数f（x）在区间12，2上的值域是 ____
