题目

下图为我国某地区的等高线地形图，读图回答图中所示的陡崖的高差至少是  A.40米       B.30米       C.20米       D.10米 答案：CSoon we arrived at farmhouse, in front of which ________. [　　] A．sat a little boyB．a tittle boy sat C．a tittle boy did sitD．did a little boy sit