单项选择题

A．Because their value has been raised since they were made.
B．Because they contain more silver than they used to.
C．Because they contain less silver than they should do.
D．Because the metal wears down in use.
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单项选择题
A．Redwood trees.B．Forest fires.C．San Francisco.D．Survival skills.
A．Redwood trees.
B．Forest fires.
C．San Francisco.
D．Survival skills.
单项选择题
Only 10% of your investment is needed to get 90% of your increase in efficiency.
A．Y
B．N
C．NG
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