But I went to bed too late the evening before, so I didn’t get up until 7:00.
Because I went to bed too late the evening before, I ______ ______ getting up at 6:00.

造成我国耕地利用北方以旱地为主，南方以水田为主的主要原因是[ ]

A．地形和地势的差异

B．科技水平的高低

C．气候条件的不同

D．耕作制度的不同