单项选择题

According to the passage, which of the following is increasingly dangerous to sea creatures

A．The sound of a car.
B．The sound of voices.
C．Man-made noise pollution.
D．The sound of steps.
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单项选择题
According to the passage, what will scientists most probably do in the future
A．They will work hard to reduce ocean noise pollution.
B．They will protect animals from harmful noises.
C．They will try to set a limit of 120 decibels.
D．They will study the effect of ocean noise pollution.
单项选择题
According to the passage, natural sounds include all of the following EXCEPT
A．sounds made by animals themselves.
B．ocean drilling.
C．underwater earthquakes.
D．the breaking of ice fields.
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