单项选择题

The author points out that differences in people's ways of life come from______.

A．their cultural traditions
B．their adaptions to the environment
C．their demands for natural resources
D．their notions about the environment
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单项选择题
The author believes the real cause for the increase of divorces today is that______.
A．people have too many sources of entertainment
B．people have less internal restraints
C．people no longer enjoy family life as they did before
D．people do not want to be confined by marital ties
单项选择题
In Paragraph 2, the word legitimate most probably means______.
A．lawful
B．biological
C．personal
D．reasonable
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