在同一幅等高线图上[ ]
A、相邻两条等高线的数值差(即等高距)相等
B、闭合等高线的中心肯定是盆地
C、等高线越密集,表示地形越平坦
D、等高线越稀疏,表示地势起伏越大
答案:A
All these questions fill my head, making _____ for me to sleep well at night. [ ]
A. it is difficult
B. it difficult
C. difficult
D. it difficulty
商品使用价值规律