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．strong win& and lack of waterB．rapid economic growthC．locked doors and windowsD．overcrowded people
A．strong win& and lack of water
B．rapid economic growth
C．locked doors and windows
D．overcrowded people
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
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