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A．Theater lobbies with uniformed security guards.
B．Clothing stores where people are relaxed and off guard.
C．Airports where people carry a lot of luggage.
D．Hotels and restaurants in southeast London.
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单项选择题
D
单项选择题
The main idea of the first paragraph is that______.
A．to define the term social class does not involve much difficulty
B．there is much alternation in people’’s social classes
C．to evaluate a person’’s social class is a very complex procedure
D．we can tell which social class a person belongs to by the way he behaves
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