of the brain are billions of tiny nerve cellsve branches connecting them to other cells in a complicated network.Communication between these brain cells is what allows us to think and solve problems.When you learn new things，these tiny connections in the brain actually multiply and get stronger.The more you challenge your mind to learn，the more your brain cells grow.Then，things that you once found very hard or even impossible to do－like speaking a foreign language or doing algebra(代数)－seem to become easy after learning them for a period of time.The result is a stronger－they were better at solving problems and learning new things.【文章大意】　科学研究发现经常学习能促进大脑的发育正如经常锻炼能使肌肉更强健一样。________．A．the function of our brain is like that of the musclew it’s impossible to explain the brain’s mystery

　　C．many people believe one’s intelligence is naturally determined

　　D．one’s brain grows stronger as the age increases

　　解析：选C。推理判断题。根据第一段中的“many people believe that a person is born smart－and stays that way in the whole life”可知C项正确。________．解析：选A。细节理解题。根据第一段中的“But new research shows that the brain is more like a muscle－it changes and gets stronger when you use it.”可知答案。n the muscles affect the brain.

　　C．The importance of the brain.

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