单项选择题
（）is to protect goods not to be deteriorated like for and medicine.
A.packaging B.special packaging C.green packaging D.vacuum 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 flow virtual data to protect the computer network.
单项选择题 （）means to provide facility for customer’s need or inquiry and arrange it.
