下图为某地区一河流某季节示意图及从甲地到乙地流水沉积物平均粒径的变化曲线图。读图,回答19~20题。 19.图中信息显示出 A.河道a处河床坡度比b处陡 B.甲地位于乙地的下游 C.整条河流冬季有凌汛 D.丘陵山地的等温线向北凸出 20.近年甲处河流颗粒物粒径减小,可能是该区域 ①耕地面积扩大 ②降水量有所减少 ③植被覆盖率提高 ④大力开发旅游业 A.①② B.②③ C.③④ D.①④ The moment that matter was put forward, serious disagreement immediately ______ between the two parties. A. rose B. raised C. contributed D. arose