Adults who were physically fit were faster at the arrow task，and their answers were just as ac- curate as their less-fit peers,the researchers found．The fitter participants also had more blood flow to a part of their brain responsible for paying attention and making decisions．

　　In a second study，15 elderly people who completed a 6-month aerobic-training course were fas-ter at attention tasks compared with 14 seniors who just did stretching and toning exercises for the same amount of time．

　　So，even going for a walk every 2 or 3 days forjust 10 to 45 minutes can help．That should be good news for your grandparents．

　 　The effects of exercising on the brains of younger people havent been studied yet．Still，it cant hurt to take occasional study breaks and go for a walk or run around with your friends．You might even do better in school．

　　Whatever you do，though，dont try to read and walk at the same time．You could end up hurting yourseff!

　　31．Walking regularly helps elderly people_______．

　　A．lose weight

　　B．become happier

　　C．concentrate better

　　D．look younger

　　32．After taking exercise for a few weeks，the mice were found to have_____．

　　A．higher blood pressure

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