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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单项选择题

The best title of the passage might be______.

A．The Criteria for Classifying Social Groups
B．Social Classes
C．Changes in Social System
D．The Evolution of Human Society

单项选择题

Which of the following statements is NOT TRUE, according to the passage

A．Slaves in Greece in the sixth century
B．
C．were not politically significant.B. The "burghers" of the later Middle Ages constituted an entirely new social class.C. To some extent, social mobility can be attributed to the growth of trade.
D．The new class made up of traders and executive officials of the later Middle Ages made the development of a money economy possibl