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單項(xiàng)選擇題

（） is not a physical wall, but a lot of virtual data to protect the computer network.

A. Date wall
B. Date channel
C. Database
D. Firewall

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單項(xiàng)選擇題

（） is meant to provide facility for customer s need or inquiry and arrange it.

A. Service
B. Business
C. Customer service
D. Making money

單項(xiàng)選擇題

Saving or reducing expenditure in business is（）

A.Save money
B.Increase cost
C.Cost planning
D.Cost control