—Haven't seen you for ages! Do you still work in Xi'an?
—________. It's four years since I worked there.
A:No, I don't.
B:No, I haven't.
C:Yes, I do.
D:Yes, I have
一个多边形的内角和是360°,这个多边形是( )
判断对错。
与呼吸作用有关,为细胞的生命活动提供能量的是( )