单项选择题

A．It’’s cheaper.
B．It’’s safer.
C．It’’s quicker.
D．It’’s convenient.
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单项选择题
Red-feather currency is one of the world’’s ________.
A．most universal types of money
B．earliest forms of money
C．most unusual forms of money
D．most complex money systems
单项选择题
A．For scientific study.B．For field guides.C．For entertainment.D．For some film background sounds.
A．For scientific study.
B．For field guides.
C．For entertainment.
D．For some film background sounds.
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