单项选择题

A．The kilogram.
B．The energy content.
C．Heat energy of water.
D．The calorie.
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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 preferences of the dealer.
C．The efficiency of production.
D．The satisfaction of the user.
单项选择题
A．Agricultural products.B．Manufactured foods.C．Settlers.D．Farm animals.
A．Agricultural products.
B．Manufactured foods.
C．Settlers.
D．Farm animals.
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