清除气体中多余的杂质，以满足商品质量需要的标准气体的过程的商品养护方法是（）
A.气调
B.气体净化
C.通风
D.熏蒸
参考答案：B
----What can I do with so much money?
----If I _______ you, I _______ give it away to charity.
A．am, will
B．am, would
C．were, would
D．was, would
简述中国物流管理发展的历史阶段。
