The weather turned out to be very good,        was more than we could expect.

A．what

B．which

C．that

D．it

青藏地区粮食主要以青稞、小麦为主的原因是

A．海拔高、气温较低

B．大气洁净、透明度好

C．河湖众多，雨水充足

D．日照时间长，昼夜温差大