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
Which of the following is discussed in the third paragraph
A．The same noise level produces a different effect on land and in the ocean.
B．Different places may have different types of noises.
C．The decibel is not a suitable unit for measuring underwater noise.
D．Different ocean animals may have different reactions to noises.
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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