单项选择题

Which of the following is the probable title of the passage

A．The British Imperial System.
B．The Customary System.
C．The International System of Units.
D．The Metric System.
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单项选择题
Which unit belongs to the Customary System
A．meter
B．kilogram
C．second
D．foot
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
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