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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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
单项选择题
A．They spent three hundred dollars on their vacation.B．They drew money than they should have from the bank.C．They lost their bankbook.D．They had only three hundred dollars in the bank.
A．They spent three hundred dollars on their vacation.
B．They drew money than they should have from the bank.
C．They lost their bankbook.
D．They had only three hundred dollars in the bank.
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