When picking up your mooring at the buoy，the correct method is to（）.

A.approach the buoy with the wind and current astern

B.approach the buoy with the wind and current ahead

C.approach the buoy with wind and sea abeam

D.stop upwind and up current and drift down on the buoy

雪线高度是指终年积雪下限的海拔。下图表示“南半球不同纬度多年平均雪线高度、气温、降水量的分布”，读图回答下题。

对南半球不同纬度多年平均雪线高度、气温、降水量曲线的表示正确的是（）

A.a

B.b

C.c

D.d