YB45/YB25型包装机烟支推烟板采用（）制品，与烟支接触频繁，容易磨损，需定期更换。
A、聚氯乙烯
B、铝材
C、有机玻璃
D、胶木
参考答案：D
Read and guess.（读一读，猜一猜是什么季节）
It's very cold and it snows. We can make a snowman. Christmas is in this season.
1. __________
It's rainy and wet. Trees and flowers begin to grow.
2. __________
It's cool and foggy. Trees lose their leaves. People can eat a lot of fruits in this season.
3. __________
It's hot and sunny. So people often go swimming in this season.
4. __________
销售物流的库存管理的策略制定必须基于（）
A、企业经营策略；
B、销售策略；
C、客户发展战略；
D、市场环境
