Kate was not sure_______.
A：that she should go through the third gate
B：if she should go through the third gate or not
C：which gate should she go through
D：which gate she should go through
下列说法：①两条直线被第三条直线所截，内错角相等；②相等的角是对顶角；③互余的两个角一定都是锐角；④互补的两个角一定有一个为钝角，另一个角为锐角．其中正确的有（ ）
下列加线词解释正确的一项是( )
