单项选择题

A．An alloy of copper and silver.
B．Pure silver or pure gold.
C．An alloy of copper and tin.
D．An alloy of gold and silver.
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单项选择题
A．Because he forgot her phone number.B．Because she hasn’’t seem him lately.C．Because he never invites her to dinner.D．Because he doesn’’t phone ahead before visiting.
A．Because he forgot her phone number.
B．Because she hasn’’t seem him lately.
C．Because he never invites her to dinner.
D．Because he doesn’’t phone ahead before visiting.
单项选择题
A．Coastal isolation.B．Resistant bark and damp climate.C．Absence of natural enemies.D．Cool weather and daily fog.
A．Coastal isolation.
B．Resistant bark and damp climate.
C．Absence of natural enemies.
D．Cool weather and daily fog.
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