单项选择题

A．15 years
B．50 years
C．six decades
D．four decades
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单项选择题
A．China and USA.B．Chile and France.C．France and Canada.D．Egypt and Greec
A．China and USA.
B．Chile and France.
C．France and Canada.
D．Egypt and Greec
单项选择题
A．popularizationB．pauseC．developmentD．ignorance and confusion
A．popularization
B．pause
C．development
D．ignorance and confusion
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