A:more pleased than to come
B:more than pleased to come
C:more pleased to come tha
D:pleased more than to come
如图所示的四种现象中,由于光的折射形成的是( )
将一副三角板按如图方式摆放在一起,且∠1比∠2大30°,则∠1的度数等于____°.