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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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
Which of the following is true of whales
A．They won't be confused by noises.
B．They are deaf to noises.
C．Their ability to reproduce will be lowered by high-level noises.
D．Their hearing will be damaged by high-level noises.
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