单项选择题

Which unit belongs to the Customary System

A．meter
B．kilogram
C．second
D．foot

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单项选择题

Two systems of weights and measures used in the U.S. are ______.

A．the U. S. Customary System and the metric system
B．the International System and the metric system
C．the Imperial System and the metric system
D．the Customary System and the Imperial system

单项选择题

As used in the 3ut paragraph of this passage, the word documnted means ______.

A．numbered
B．recorded
C．legal
D．believable

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