单项选择题

The intensity of noise can be measured by ______.

A．its effect on people's hearing
B．its decibel
C．how much it affects people psychologically
D．how long it lasts
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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
单项选择题
According to the passage, in which way have the elassitied advertisements changed nowadays
A．They depend more on display type.
B．More money is charged for them.
C．They are divided into more groups.
D．They are less formal.
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