单项选择题

A．Because it costs less.
B．Because teachers will learn quickly.
C．Because it is required by experts.
D．Because the cultural patterns are divers
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单项选择题
A．world civilizationB．language developmentC．physics and chemistryD．literature
A．world civilization
B．language development
C．physics and chemistry
D．literature
单项选择题
A．environmentB．populationC．cultureD．economic growth
A．environment
B．population
C．culture
D．economic growth
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