单项选择题

A．On May 24th.
B．Not mentioned.
C．On May 23rd.
D．In July,
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单项选择题
With physical products the only thing you need is good taste and attention to detail.
A．Y
B．N
C．NG
单项选择题
What was the main concern of industrialists before the marketing concept was widely accepted
A．The needs of the market.
B．The efficiency of production.
C．The satisfaction of the user.
D．The preferences of the dealer.
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