(2013·四川省宜宾五校二调)A recent study has ________ an unexpected conclusion that the African elephant should be divided into two different species.

A．kept up with

B．made up with

C．caught up with

D．come up with

下列指标中，( )是从业人员平均每人创造的国内生产总值，它综合反映社会经济活动中活劳动消耗的经济效益。

A．GDP增长率
B．劳动生产率
C．人均GDP增长率
D．全要素生产率