B．The sound of voices.

　　C．Man­made noise pollution.

　　D．The sound of steps.

　　17．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.

　　18．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.

　　19．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.

　　B

　　The sea has always interested man.From it he can get food, minerals, and treasure.For thousands of years, he could sail on it.But he could not go far beneath its surface.

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