单项选择题

A．90% copper and 10% silver.
B．90% silver and 10% copper.
C．90% silver, 9% copper, and 1% lead.
D．None of these.
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单项选择题
A．It has a good view of the coast.B．It is near San Francisco.C．It has no admission fee.D．It can be seen in one hour.
A．It has a good view of the coast.
B．It is near San Francisco.
C．It has no admission fee.
D．It can be seen in one hour.
单项选择题
A．To look for a different lifestyle.B．To enjoy themselves.C．For adventure.D．For education.
A．To look for a different lifestyle.
B．To enjoy themselves.
C．For adventure.
D．For education.
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