单项选择题

The word "cumulative" in Line 3 most probably means______.

A．decisive
B．extremely beneficial
C．strong
D．progressively greater
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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
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