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
We can conclude from this passage that ______.
A．the heat created in microwave ovens is very difficult to control
B．food tastes better when cooked in a microwave oven
C．food cooked in microwave ovens is probably more nutritious than food cooked in more conventional ways
D．most research on the effects of microwaves on human beings has been restricted to the study of low level microwave radiation
单项选择题
The author' s tone is ______.
A．objective
B．sarcastic
C．negative
D．skeptical
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