如图,在△ABC中,点D是边AB上一点,点E是边AC上一点,且DE∥BC,∠B=40°,∠AED=60°,则∠A的度数是( )
A:100°
B:90°
C:80°
D:70°
— How is the weather?
— It's cloudy.
There ______ a library and three Xinhua bookshops in the town.
如图:PC∥AB,QC∥AB,则点P、C、Q在一条直线上.理由是:____.