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A．indication
B．sign
C．symbol
D．reference
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单项选择题A．namedB．named forC．named asD．named after

A．named
B．named for
C．named as
D．named after

单项选择题Sound , as defined by the psychologists,

A．can be measured in the same way that "noise" is measured
B．may be extremely harmful to health
C．is not at all different from "noise"
D．can be measured by machines