△ABC中,若∠A﹕∠B﹕∠C=1﹕2﹕3,则它们的相应邻补角的比为( )。
5﹕4﹕3
The moment we had been looking forward to at last.
A.coming
B.come
C.comes
D.came
被动吸烟含有哪些有害物质?