The villagers used to______ drinking water from the river nearby, but now they spend two hours _______ to get it in the mountain because of the dry weather in Yunnan.

A．getting, to walk

B．get, walking

C．getting, walking

D．get, to walk

经济周期的中周期又称中波，指一个周期平均长度为8年到10年，通常又被称作（）。

A.康德拉耶夫周期

B.朱格拉周期

C.基钦周期

D.不能确定