单项选择题

A．A standard unit for measuring weight.
B．How to care for precious metals.
C．The value of precious metals.
D．Using the metric system.
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单项选择题
A．It may not be warm enough.B．The woman can wear it all winter.C．It will not fit if the woman loses weight.D．The woman may have trouble paying for bt.
A．It may not be warm enough.
B．The woman can wear it all winter.
C．It will not fit if the woman loses weight.
D．The woman may have trouble paying for bt.
填空题
The federal government operates insurance such as ______ whose premiums most people could not afford to pay.
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