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.
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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.
单项选择题
A．Because it stimulates your nerve activity.B．Because it keeps you calm.C．Because it strengthens your memory.D．Because it improves your problem solving strategies.
A．Because it stimulates your nerve activity.
B．Because it keeps you calm.
C．Because it strengthens your memory.
D．Because it improves your problem solving strategies.
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