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.
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问答题
__________is a stable way to help homeless children or youth get rid of poverty.
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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