用“√”为加粗的字选择正确读音。
扫兴(xīng xìng) 一匹马(pī pǐ) 招呼(hū hu)
xìng pǐ hu
The students from Xinjiang enjoy staying in our school because everyone is _____ to them.
A.friendly
B.gently
C.happily
D.politely
当光垂直入射到水面时,其入射角为 ,反射角为 ,折射角为 。