In Disneyland every year, some 800,000 plants are replaced because Disneyland refused to _______ signs asking his “guests” not to step on them.

A．put down

B．put out

C．put off

D．put up

描述定量资料集中趋势的指标有（）

A.均数、四分位数间距、变异系数

B.均数、几何均数、四分位数间距

C.均数、变异系数、几何均数

D.均数、几何均数、变异系数

E.均数、几何均数、中位数