题目

Wow! These flowers        very nice. Do you like them?               A. look                  B. looks                  C. to look                D. looked 答案：A三维柱形图中柱的高度表示的是（　　）A．各分类变量的频数B．分类变量的百分比C．分类变量的样本数D．分类变量的具体值