单项选择题
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A.Around 6 p.m..
B.Around 7 p.m..
C.Around 7:30 p.m..
D.Around 8:30 p.m..
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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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cleanliness
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