单项选择题

It can be inferred from the passage that by the end of World War Ⅱmost Americans______.

A．were very rich
B．live in poverty
C．had the good things on the first three levels
D．did not own automobiles
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单项选择题
According to the passage, man will begin to think about such needs as housing and clothing only when______.
A．he has saved up enough money
B．he has grown dissatisfied with his simple shelter
C．he has satisfied, his hunger
D．he has learned to build houses
单项选择题
What is the main concern of man on the fourth level
A．The more foods the better.
B．The more mental satisfaction the better.
C．The more "luxury" items the better.
D．The more earnings the better.
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