单项选择题

A．They should help maintain the equipment.
B．They should keep a watchful eye on their children.
C．They should stop their children from climbing ladders.
D．They should teach their children how to use the equipment.
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单项选择题
D
单项选择题
To put it in a simpler way, the marketing concept is ______.
A．a kind of persuasive salesmanship
B．an effort to turn goods into money
C．a customer-centered approach
D．a surest way to greater profit
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