閱讀理解（第3l～45題，每題3分，共15分）

　　請根據(jù)短文內(nèi)容，為每題確定1個最佳選項。

　　　Walking to Exercise the Brain

　　Do you think sitting and studying all the time will improve your grades?Think again．Getting some exercise may help，too．

　　New research with older people suggests that taking regular walks helps them pay attention better than if they didn't exercise．

　　Previous research had shown that mice learn，remember，and pay attention better after a few weeks of working out on a running wheel．Mice that exercise have greater blood flow to the brain than those who don't．Their brain cells also make more connections．

　　Neuroscientists from the University at Urbana-Champaign wanted to find out if the same thing is true for people．First，they measured the physical fitness of 41 adults，ages 58 to 77，after each per-son walked 1 mile．Then，participants looked at arrows on a computer sczeen and had to use com-puter keys to show which way one particular arrow was pointing．

　　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 haven't been studied yet．Still，it can't 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，don't 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

　　B．faster heartbeat

　　C．more blood flow to the brain

　　D．better appearance

　　33．The first study on 41 elderly people found______．

　　A．the less-fit participants did arrow tasks faster

　　B．the fitter participants did arrow tasks faster

　　C．the less-fit participants gave more accurate answers

　　D．the fitter participants gave more accurate answers

　　34．It can be good for health when one takes a walk every 2 or 3 days for at least______．

　　A．3 minutes

　　B．45 minutes

　　C．30 minutes

　　D．10 minutes

　　35．It is suggested in the last paragraph that people should______．

　　A．run around once a week

　　B．not read and walk at the same time

　　C．go for a walk every day

　　D．not hurt their friends while exercising

　　參考答案及解析

　　31．C [解析]本題是細(xì)節(jié)考查題。題目是老年人經(jīng)常運動有助于以下哪項。原文是第二段"對老年人的新研究顯示經(jīng)常運動能讓老年更集中精力"。選項A"減肥"；選項B"更愉快"；選項C"精力更集中"；選項D"顯得年輕"。因此只能選C。

　　32．C [解析]本題是細(xì)節(jié)考查題。原文是第三段"以前的研究證明老鼠在輪子上奔跑數(shù)周后它們的學(xué)習(xí)、記憶和集中程度都有所提高。運動的老鼠大腦中的血液流量大于不運動的，而它們腦細(xì)胞的聯(lián)系也更頻繁。"選項A"更高的血壓"；選項B"更快的心跳"；選項C"有更多血液流經(jīng)大腦"；選項D"更好的外表"。因此只能選C。

　　33．B[解析]本題是細(xì)節(jié)考查題。原文是第五段"研究員發(fā)現(xiàn)身體健康的成年人完成箭頭測試的速度更快，他們的答案和身體狀況不佳的參加者一樣準(zhǔn)確。"選項A"身體狀況不佳的參賽者完成箭頭測試更快"；選項B"身體健康的參賽者完成箭頭測試的速度更快"；選項C"身體狀況不佳的參賽者在箭頭測試中答案更準(zhǔn)確"；選項D"身體健康的參賽者在箭頭測試中答案更準(zhǔn)確"。因此只能選B。

　　34．D [解析]本題是細(xì)節(jié)考查題。原文是第七段"因此每兩到三天僅僅出去散步10到45分鐘都會對健康有益。"因此只能選D。

　　35．B[解析]本題是細(xì)節(jié)考查題。原文是最后一段"不管你怎么做都不要一邊走路一邊讀書，你有可能傷到自己的哦"。選項A"一周跑一次步"；選項B"不要同時走路和讀書"與原文內(nèi)容一致；選項C"每天散步"；選項D"運動時不要傷著朋友"。因此答案選B"。

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