单项选择题

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