–Can you guess if they ______ to play basketball with us?

–I think they’ll come if they _____ free.

A．will come; are

B．will come; will be

C．come; are

D．come; will be

质重的饮片应放的药斗位置是（）

A.上层中间

B.下层右侧

C.中层左侧

D.低层易抽拉的一侧

E.高层