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．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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