单项选择题

Different ways of life exist among different peoples because of______.

A．their adaptive value
B．their distinctive value
C．lack of better technology
D．mutual isolation
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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
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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