物流系统随需求、供应、渠道、价格的变化，而难于长期稳定。这一现象体现物流的（）特征。
A.系统性
B.客观性
C.大跨度性
D.动态性
参考答案：D
根据下面对话中的情景，在空白处填入适当的语句，使对话内容完整。
(Jenny and Nancy meet on the street. )
J=Jenny；N=Nancy
J: Hello,Nancy. 1
N: Fine, thanks,Jenny.
J: I heard you went somewhere for vacation.
2
N: Well,I have been to Hainan Island with my cousins. There are too many exciting things there,especially diving(潜水)in the real sea!
J: 3 My parents and I will go there , too. What should we take?
N: A camera,sunglasses,umbrellas and some cool clothes.
J: OK,thank you. 4
N: You can get there by plane. Because It's too far away. 5
J: Thank you! I think we sure will !
点火提前角
