色彩可以通过色相、（）、饱和度三个属性来研究它的性质。
A.色料
B.色调
C.颜色
D.明度
参考答案：D
_________ pleased me was that there was my purse, in the back seat of the taxi, _____ the driver couldn’ t possibly see it before.
A．That ; that
B．Which ; which
C．What ; where
D．How ; when
推行草原家庭承包制，要按照（）的原则进行。
A.短期
B.长期
C.到户
D.集约
