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
Social organizations and technology develop as a result of people's______.
A．adaptation to the environment
B．attempt to change nature
C．efforts to create peaceful societies
D．desire to create bigger societies
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
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