根据物流活动发生的先后次序，企业物流垂直结构可划分为：供应物流、生产物流、销售物流和回收、废弃物物流。
参考答案：错
— Has Sam finished his homework today, Anne?
— I have no idea. But he ________ it this morning. [ ]
A .did
B. had done
C. was doing
D. had done
当与沮丧的患者沟通时，应该（）。
A.阻止他们因情绪沮丧而哭泣
B.告诉他们哭是软弱的表现
C.当其希望独自安静休息时，应坚持陪同
D.应鼓励患者说出沮丧的原因
E.尽量减少与沮丧患者的沟通
