题目

读下图，写出图中字母代表的地形区名称。（1）④是黄河入海的省份____省，支流③为 ___________ 河（2）黄河下游地区流域面积很小，支流少的原因是下游是_____________。（3）黄河的泥沙主要来自中游的__________地区，试举一例治理水土流失的措施_______（4）黄河在上游塑造了_____平原和内蒙古_____平原，流经此河段，黄河水量____（增大、减少）。（5）经常断流的黄河下游连续几年来未出现断流，其原因是（_____）A.黄河上中游地区工农业的发展有所减缓 B7. The birthrate in Europe has been in a steady decrease since the 1960s. European countries,realizing crisis is         ，are providing great encouragement for parents to create more babies.   A. at a loss   B. at any rate   C. at hand   D. at first