图1中甲地年降水量约为1000mm，乙地年降水量约为500mm。图2示意四地气温年内变化。据此完成1~2题。

1、造成甲、乙两地降水量差异显著的主导因素是[ ]

A、纬度位置

B、大气环流

C、地形

D、洋流

2、图2中与甲地气温年内变化相符的曲线是[ ]

A、①

B、②

C、③

D、④

In comparison to electric power，hydraulic power for jacking systems has the advantage of（）.

A.better control capabilities

B.less maintenance and repair

C.fewer personnel needed during jacking

D.less preload needed