诗句“人间四月芳菲尽，山寺桃花始盛开”中所蕴含的地理原理是 [ ]

A、纬度不同，则气温不同

B、海拔越高，气温越低

C、南方的热量比北方多

D、同一纬度，海洋与陆地的气温不同

The medicine has many functions,______are unknown to us.

A．some of which

B．that some of them

C．of which some of them

D．which of them