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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单项选择题
The apparently contradictory phenomenon is that _____.
A．mothers of premature babies took their babies to a follow-up clinic
B．all mothers of premature babies were seen to hold their children differently from other mothers
C．The behaviour of mothers of premature babies rejected Lee Salk's theory
D．mothers of premature babies held their babies 9n the correct side
单项选择题
Salk's experiments proved that _____.
A．mothers have an instinct to hold their babies on the left immediately after birth
B．mothers find it more comfortable to carry their babies on the left
C．mothers tend to hold their babies on the left at times of stress
D．mothers of premature babies have no instinct to hold their babies on the left
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