— Hey, you haven't been acting like yourself. Everything is OK?

—         . [ ]

A. I'm fine, thanks

B. Sure, it is  

C. That's good      

D. It's OK

夏季室外平均风速应( )。

A．采用累年最热3个月各月平均风速的平均值

B．采用累年最热3个月各月平均风速的最大值

C．采用累年最热门平均风速

D．采用累年最热月的最大风速