稻谷经砻谷机脱去颖壳后即可得到（）。
参考答案：糙米
Recently I bought an ancient Chinese vase (花瓶), _____ was very reasonable. [ ]
A. which price
B. the price of which
C. its price
D. the price of whose
极度精神发育迟滞的IQ值为（）
A.50～69
B.35～49
C.20～34
D.20分以下
E.10分以下
