Floods in the upper reach of the River Nile ________ the rich soil in this area.[ ]
A. brought up
B. accounted for
C. consisted of
D. set out
答案:B
Floods in the upper reach of the River Nile ________ the rich soil in this area.[ ]
A. brought up
B. accounted for
C. consisted of
D. set out
答案:B