单项选择题

A．Weakened short-term memory.
B．Weakened strength.
C．Poor decision-making ability.
D．Poor concentration.
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单项选择题
A．An alloy of copper and silver.B．Pure silver or pure gold.C．An alloy of copper and tin.D．An alloy of gold and silver.
A．An alloy of copper and silver.
B．Pure silver or pure gold.
C．An alloy of copper and tin.
D．An alloy of gold and silver.
单项选择题
Girls tend to drop out of math sooner than boys probably because______.
A．girls have more anxiety
B．they are born different with respect to math
C．girls are mature later than boys
D．boys are more intelligent than girls at different age levels
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