Older people can develop their brains as well.Cornell University studied a group of seniors who have a short­term memory increase up to 40 percent after exercising just three hours a week.The exercise does not have to be very difficult，but it does have to increase the heart rate.Also，just like the motion for babies，exercise for older people should not be too simple.Learning some new skills or actions，such as with yoga or tai­chi helps to open up memory paths in the brain that may not have been used for a long time.For most people，any type of physical activity that increases the heart rate is helpful.The main aim is to increase the brain's flow of blood.And your brain can benefit from as little as two to three hours of exercise a week.

　　【语篇解读】研究发现锻炼身体有助于大脑发育。爱好运动的儿童的大脑要比运动少的儿童的大脑发育得迅速的多，很多小学生产生学习困难的原因是由于儿时缺乏运动引起的。对于老人练习瑜珈、太极拳等运动对大脑也是有好处的。

　　1．What is the main idea of this passage?

　　A．How exercise makes people strong.

　　B．How to get good scores on a test.

　　C．How exercise helps the brain.

　　D．How the brain can change.

　　解析：考查主旨大意。只有C项才对文章具有概括性和针对性。D项有一定的干扰性，但根据第一段中的“...cause physical changes in the brain.”可知是大脑内部发生了物理变化，而不是大脑本身发生了变化。

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