— No, you ________. You ________ sing others like You Raise Me Up.
A:can't; must
B:mustn't; can
C:may not; must
D:needn't; may
如图所示,有一束光线从空气射入某种透明介质,在分界处发生反射和折射(其中∠4=∠5),其中____是反射光线,折射角是____,空气在____(选填“AE的上方”、“AE的下方”、“CG的左方”或“CG的右方”).
下列说法中错误的是( )