Scientists do not know how much and what kinds of noises are harmful to ocean animals. However, many scientists don't think that noise is a greater danger than they believed. They want to prevent noises from harming creatures in the ocean.

　　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

　　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.

　　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 sea 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.

　　Many people think of the brain as a mystery.They don’t know much about intelligence and how it works. When they do think about what intelligence is，many people believe that a person is born smart，average，or dumb—and stays that way in the whole life.But new research shows that the brain is more like a muscle—it changes and gets stronger when you use it.And scientists have been able to show just how the brain grows and gets stronger when you learn.

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