B.The sound of voices.
C.Manmade noise pollution.
D.The sound of steps.
17.According to the passage, natural sounds include all of the following EXCEPT________.
A.sounds made by animals themselves
B.ocean drilling
C.underwater earthquakes
C.the breaking of ice fields
18.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.
19.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 highlevel noises.
D.Their hearing will be damaged by highlevel noises.
20.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.
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