单项选择题

A．Fire prevention.
B．House construction.
C．Toxic chemicals.
D．Insects Elimination.
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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
With the invasion of the Australian pound, red-feather currency has ________.
A．maintained its value
B．found increased usage
C．fallen into disuse
D．declined in value
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