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 ultimate goal in developing technology is for people to______.
A．get practical skills and arts
B．obtain greater amounts of energy
C．effect social changes
D．create new cultures
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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