A:③→①→②→⑤→④
B:①→③→②→④→⑤
C:③→②→①→⑤→④
D:②→①→③→⑤→④
This is the first time that your parents have been abroad, ______?
如图,已知△ABC为直角三角形,∠C=90°,若沿图中虚线剪去∠C,则∠1+∠2等于( )