2016年12月英语四级阅读200篇：生活中三种疲劳思维导图

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2016年12月英语四级阅读200篇：生活中三种疲劳思维导图

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　　Three Kinds of Fatigue 　　Fatigue is one of the most common complaints brought to doctors, friends, and relatives. You'd think in this era of labor-saving devices and convenient

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ThreeKindsofFatigue

Fatigueisoneofthemostcommoncomplaintsbroughttodoctors,friends,andrelatives.You'dthinkinthiseraoflabor-savingdevicesandconvenienttransportationthatfewpeoplewouldhavereasontobesotired.Butprobablymorepeoplecomplainoffatiguetodaythaninthedayswhenhaywasbaledbyhandandlaundryscrubbedonawashboard.

Thecausesofmodern-dayfatiguearediverseandonlyrarelyrelatedtoexcessivephysicalexertion.Therelativelyfewpeoplewhodoheavylaboralldaylongalmostnevercomplainaboutbeingtired,perhapsbecausetheyexpecttobe.Today,physiciansreport,tirednessismorelikelyaconsequenceofunder-exertionthanofwearingyourselfdownwithover-activity.Infact,increasedphysicalactivityisoftenprescribedasacureforloweringenergy.

Physical.Thisisthewell-knownresultofoverworkingyourmusclestothepointwheremetabolic(新成代谢的)wasteproducts—carbondioxideandlacticacid(乳酸)—accumulateinourbloodandreduceyourstrength.Yourmusclescan'tcontinuetoworkefficientlyinabathofthesechemicals.Physicalfatigueisusuallyapleasanttiredness,suchasthatwhichyoumightexperienceafterplayingahardsetoftennis,choppingwood,orclimbingamountain.Thecureissimpleandfast:Yourest,givingyourbodyachancetogetridofaccumulatedwastesandrestoremusclefuel.

Pathological(病理的).Herefatigueisawarningsignorconsequenceofsomeunderlyingphysicaldisorder,perhapsthecommoncoldorfluorsomethingmoreseriouslikediabetesorcancer.Usuallyothersymptomsbesidesfatiguearepresentthatsuggestthetruecause.