A: You have really good teeth; they are white and neat. B: Hey, they are artificial. A: Are they? B: Yes, they are. Question: Are the man's teeth real or not?
The pattern of "又(yòu) ......又(yòu)......" is used to denote two actions happening at the same time, or two coexisting conditions or situations. It connects verbs or adjectives, with the same or different subjects. For example:
这个西瓜又大又甜。The watermelon is big and sweet.
他们又唱又跳,非常热闹。They sang and danced, having a very jolly time.
山又高,路又滑,走起来很困难。The mountain is high and the road is slippery. It's very difficult to walk.
An alternative question is a question that gives two or more options for the other to choose from. The commonly-used structure is "A还是(háishì)B " or "是(shì)A还是(háishì)B ". For example:
你喝茶还是喝咖啡? Would you like to drink tea or coffee?
你们坐火车还是坐飞机? Are you going to take a train or a plane?