单项选择题


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
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