题目

黄河干流流经的地形区为：①青藏高原 ②华北平原 ③黄土高原 ④内蒙古高原按从上游至下游的顺序排列，正确的是（ ） A . ①②③④ B . ①④③② C . ①④②③ D . ②③④① 答案：B—Hey, Mary. I hear there’s a new cartoon movie NE ZHA: I am the destiny. Would this evening be________for you?— Oh, sorry. I have a math test tomorrow and I have to study for it.A.necessaryB.convenientC.normal