--- Why is the cake so expensive?
---- Maybe you don’t know a cake made of wheat costs less than made of rice.
A. one
B. that
C. the one
D. another
网友回答
(答案→)A. one
B. that
C. the one
D. another
解析：
试题分析:考查不定代词用法。根据句意可知此处是大米做的蛋糕和小麦做的蛋糕相比，蛋糕是可数名词，而且在此处是泛指概念，所以要用one代替，故A选项正确。句意：---为什么蛋糕这么贵呢？---或许你不知道小麦做的蛋糕要比大米做的蛋糕成本低吧。