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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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.
单项选择题
Microwaves are ______.
A．absolutely safe at low levels
B．very efficient for cooking
C．cancer-causing iii people with weak eyes
D．completely understood by scientists
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