保持商品的数量和质量不变的包装，属于工业包装。
参考答案：对
Let ____________ clean the blackboard. [ ]
A. I
B. me
C. our
His mother had thought it would be good for his character to ________ from home and earn some money on his own.
A．ran away
B．take away
C．keep away
D．get away
