区别就是
open question 开放式问题。close question 封闭式问题。开放式问题是没有预先想好的答案供选择，自由回答。封闭式问题是预先想好答案，让回答者从中选择。
Open:
What is your favorite color?
So I'm asking you what your favorite color is， you could say any color you like.
Close:
Do you like blue?
I don't think there are any other answers here other than "Yes" or "No，" so those are "closed" questions
