— What a fine day!  Shall we go picnicking?

— ____. But we need to be home before six o'clock for  the football match.     [ ]

A. Have a nice time            

B. Pardon me    

C. That's great                  

D. You are right

温室内的热水管排列要求保证水平方向温度不超过（）℃。

A、1

B、5

C、10

D、15