--- I want to know if she ______ in my birthday party tonight.                  

--- I believe if she ______ her homework, she will join us.

A．will join; will finish

B．will join; finishes

C．joins; finishes

D．joins; will finish

亚欧大陆中部、北美洲中部和南美洲南部全都有分布的自然带是（）。

A.热带草原带

B.热带沙漠带

C.温带草原带

D.温带森林带