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  3. Doctors are starting to find more and more information that suggests a connection between exercise and brain development. Accord

Doctors are starting to find more and more information that suggests a connection between exercise and brain development. Accord

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问题     Doctors are starting to find more and more information that suggests a connection between exercise and brain development. According to some researches, it seems that exercise can make blood vessels, including those in the brain, stronger and more fully developed. The effects of exercise on brain development can even be seen in babies.(72)Babies who do activities that require a lot of movement and physical activity show greater brain development than babies who are less physically active. Margaret Barnes, a pediatrician, believes in the importance of exercise.(73)She thinks that many learning disabilities that children have in elementary school or high school can be traced back to a lack of movement as babies.
    In studies with seniors, research has shown that exercise helps older people as well. The exercise does not have to be very difficult. The main goal is just to increase the heart rate. And especially when learning new movements, such as yoga or tai chi, it appears that new memory paths open up in the brain. This can improve people’ s short-term memory.
What is the main idea of this passage?
选项 A、How to take exercise.
B、How exercise helps the brain.
C、How to enjoy music.
D、How the brain can change.
答案B
解析 主旨大意题。文章第一段开头便指出运动与大脑发育有联系，接下来又通过一些研究分别说明了运动对幼儿和老人大脑发育的促进作用。故选B。
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