单项选择题

A．Watch her partner playing the game.
B．Play her cards in cooperation with her partner.
C．Quit the game.
D．Teach the man how to play bridge.
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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.
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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substances
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