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
It's a general belief that a child' s later character and personality is _________ decided by his early experiences both at home and in school.
A．chiefly
B．by chance
C．entirely
D．seldom
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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