单项选择题

What is the meaning of recycle? （）

A. Collect, treat and use again
B. Movement in a cycle
C. Return to original
D. Return goods

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单项选择题

A. Sales
B. Sales and logistics
C. Returned logistics
D. Back and forth

单项选择题

A. Location of market
B. Government regulation
C. competition
D. Seasonality of products flow

单项选择题

A. Linkages
B. Distances
C. Equipment
D. Time