Everyone knows that when you lift weights,your muscles get bigger and you get stronger.A person who can抰 lift 20 pounds when they start exercising can get strong enough to lift 100 pounds after working out for a long time.That抯 because the muscles becomee
larger and stronger with exercise.And when you stop exercising,the muscles shrink and you get weaker.That抯 why people say,揢se it or lose it!?si
But most people don抰 know that when they practice and learn new things,parts of their brain change and get larger a lot like muscles do when they exercise.Inside the cortex (f脑皮层)of the brain are billions of tiny nerve cells.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 seem to become easy.The result is a stronger and smarter brain.
Scientists started thinking that the human brain could develop and change when they studied animals?brains.They found out that animals who lived in a challenging environment,with other animals and toys to play with,were more 揳ptitudinal敆they were betteree
at solving problems and learning new things.
24.What抯 the main idea of thte passage?()
A.Scientists show strong interest in what intelligence is.
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