— In Western countries, women don't want others to know their ages. 

— Right. So it is _____ to ask a woman her age in Western countries.  [ ]

A. rude

B. formal

C. polite

D. usual

空气调节，就是通过采用一定的技术手段，在某一特定空间内，对（）进行调节和控制，使其达到并保持在一定范围内，以满足工艺过程和人体舒适的要求。