问题详情

The author"s description of the Colorado River flow rate mentions which of the following？
A．Over 100000 CFS before the building of the Dam.
B．8000～20000 CFS before the building of the Dam.
C．8000～100000 CFS after the building of the Dam.
D．20000 CFS at peak rate after the building of the Dam.请帮忙给出正确答案和分析，谢谢！