急流回转赛选手在动水域要越过设有（）个障碍门的水道。
A.15
B.20
C.22
D.25
参考答案：D
The place was flooded ________ it had been raining for several weeks.[ ]
A. because
B. because of
C. ever since
D. as a result of
党的十八大第一次把“充分发挥人民政协作为协商民主重要渠道作用”写进了报告。人民政协的两大主题是
A．协商和民主
B．团结和民主
C．参政议政和民主监督
D．爱国和政治协商
