题目

Recently I bought an ancient Chinese vase, _____ was very reasonable.     A.which price C.the price of which     B.its price D.the price of whose   答案：C6．合唱队高年级学生的人数是低年级学生人数的4倍．下面图中表示出了低年级的人数，请根据倍数关系画出表示高年级学生人数的图．