选择疑问句是为询问对象准备两个或者多个选项，让对方选一个。供选择对象一般是两个，也可以是多个，or 前升调，后降调
时你可以选择其中一个进行回答。
如：
Will you go there by bus，by car or by taxi
你是坐公交车、坐小汽车还是打的去那
I will go there by taxi.
What would you like，beef or steak
你想要什么，牛肉还是牛排
I'd like some beef.
Can you sing or dance?
你会唱歌还是会跳舞
I can sing.