A：1
B：4
C：100
D：300
如图，已知直线a∥b，∠1=40°，∠2=60°．则∠3等于（ ）
“南朝四百八十寺，多少楼台烟雨中”，诗句中的“南朝”四个朝代的先后顺序依次为（ ）
— How do you like the regulations of our school?
— The regulations are strict with the students and they require that students _______ at least 90% of the lectures.
