Fire prevention．,House construction．,Toxic chemicals．,I-找考题网

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 ________.

单项选择题With the invasion of the Australian pound, red-feather currency has ________.

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