统计数据分为分类数据、顺序数据和数值型数据的依据是（）
A.价值单位
B.计量单位
C.计量尺度
参考答案：C
______ about wild plants that they decided to make a trip to Madagascar for further research [ ]
A. so curious the couple was
B. So curious were the couple
C. How curious the couple were
D. The couple was such curious
下列工程项目中，属经营性水利工程项目的是（）。
A.灌溉供水
B.水力发电
C.水产
D.旅游
