单项选择题
（）is used to protect goods not to be deteriorated like food and medicine.
A.packaging B.Green Packaging C.Vacuum packaging D.Special packaging
单项选择题 （）is the way to deliver goods for different shippers in the same truck, by the most economic route.
单项选择题 （）is not a physical wall, but a lot of virtual data to protect the computer network.
单项选择题 （） is meant to provide facility for customer’s need or inquiry and arrange it.
