机器设备的经济寿命与（）等因素有关。

A.设备的物理性能

B.国家产业、能源、环保政策

C.设备配套情况

D.设备使用人员的技术水平

E.设备生产的产品的市场状况

The passer-by jumped into the cold water to save the _____ boy, who cried for help, but it was too late and the boy was _______ at last.

A．drowning; drowned

B．drowned; drowning

C．drowning; drowning

D．drowned; drowned