消费者的个性具有的显著特征是（）
A.稳定性
B.整体性
C.独特性
D.倾向性
E.可塑性
参考答案：A, B, C, D, E
_______ about wild plants that they decided to make a trip to Madagascar for further research.
A．So curious the couple were
B．Such curious the couple were
C．Such curious were the couple
D．So curious were the couple
当无差异曲线为分别平行于X、Y轴的直角形时表明，X和Y的关系为（）
A、完全互补品
B、完全替代品
C、没有关系
D、互不相关
