A:已烯、苯、四氯化碳
B:苯、已炔、已烯
C:已烷、苯、环已烷
D:甲苯、已烷、已烯
如图,已知△ABC为等边三角形,若沿图中虚线剪去∠B,则∠1+∠2等于( )
—Don't you know he's passed the computer science examination? He's been ________ ever since.