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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单项选择题

According to the passage, which of the following is sound rather than noise

A．A couple's whisper behind you in the cinema.
B．The snore of your roommate.
C．The loud motor- horn in the street.
D．The sound of airplanes taking off and landing when you are waiting to board a plan

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.