We have sent some books to the children in that village. However, they still need ______.

A．more

B．much

C．many

D．most

如果规模报酬和投入的资本量不变，对于生产函数Q＝f(L，K)，单位时间里增加15%的劳动使用量，则产出将( )。

A．增加大于15%

B．减少15%

C．增加15%

D．增加小于15%