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．Help the man plan a student rally.B．Use the student parking lot.C．Make a donation to support the group.D．Sign a petition.
A．Help the man plan a student rally.
B．Use the student parking lot.
C．Make a donation to support the group.
D．Sign a petition.
单项选择题
A．He already knows how to play.B．He doesn’t like playing games.C．He doesn’t have a partner.D．He doesn’t have enough free time.
A．He already knows how to play.
B．He doesn’t like playing games.
C．He doesn’t have a partner.
D．He doesn’t have enough free time.
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