10，12.18，36，90，( )
A．252
B．250
C．144
D．142
参考答案：A
They are_____ laborers who know how to spread the height of the rocks they carry.[ ]
A. ambitious
B. potential
C. energetic
D. experienced
不显著的直线相关或回归关系不一定说明X和Y没有关系。（）
