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单项选择题
A．The invention of machines.B．The invention of the alphabet.C．The invention of rockets.D．The invention of agriculture.
A．The invention of machines.
B．The invention of the alphabet.
C．The invention of rockets.
D．The invention of agriculture.
单项选择题
A．Their academic performance will affect their future careers.B．They are involved in student affairs.C．They have to observe university discipline.D．They want to run for position of authority.
A．Their academic performance will affect their future careers.
B．They are involved in student affairs.
C．They have to observe university discipline.
D．They want to run for position of authority.
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