W: You look like you are freezing to death. Why don’t you put this on
M: Thank you, it was so warm at noon, I didn’t expect the weather to change so quickly.
Question: What do we learn from the conversation().

A. The woman didn’t expect it to be so warm at noon.

B. The woman is sensitive to weather changes.

C. The weather forecast was unreliable.

D. The weather turned cold all of a sudden.

如果一个多边形的内角和是1440°，那么这个多边形是______边形．