A.The sound of cars. | B.The sound of voices. |
C.Man-made noise pollution. | D.The sound of steps. |
A.sounds made by animals themselves |
B.ocean drilling |
C.underwater earthquakes |
D.the breaking of ice fields |
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 right unit (单位) for measuring underwater noise. |
D.Different ocean animals may have different reactions to noises. |
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. |