以下说法正确的是()
A:光的偏振现象说明光是一种横波
B:雨后路面上的油膜呈现彩色,是光的折射现象
C:相对论认为空间和时间与物质的运动状态无关
D:光导纤维中内层的折射率小于外层的折射率
Helen is looking forward to ________ her mother soon.
— What do you think of tomorrow's football match? — _______ difficult for us _______ the match.