lttheydonotonlylookyoungerandslimmerbutfeelbetter.Becauseofincreasedphysicalfitnesslifeexpectanceinthenationhasrisentoseventy-threeyearswithfewerpeoplesufferingfromheartdiseasethenation'snumberonekiller.
Jogging(慢跑)theeasiestandcheapestwayofimprovingthebodykeepsover30millionpeopleofallagesontherun.Forthepriceofagoodpairofrunningshoesanyoneanywherecanjointherace.
Dietingtoohasbecomeanational pastime.Promotersofdietsthateliminateeatingonethingoranothersuchasfatsorcarbohydrates(碳水化合物)promiseasmuchas20-poundweightlosseswithintwoweeks.Booksdescribingsuchamazingdietsalwaysheadup(居……之首)thebest-sellerlistsbecausepeoplewhoareoverweightwanttoloseweightquicklyandeasily.
Neverthelessjogginganddietingcarriedtoextremescanbeharmful.Manyconfusedjoggersoverdoandfinallysufferfromankleandfootdamage.Dietingfortunatelybecomesonlyatemporarymeansforsheddingafew poundswhilethebodylosethebalancednutrition(营养)itrequiressomostdieterscannotkeepondiets.Aboveallcommonsenseshouldbethekeystoneforanydietingandexerciseplan.
6.Themainideaofthispassageisthat___________.
A.bothjogginganddietingcanimproveyourhealth
B.exerciseandimproveddiethasraisedtheAmerican'slifeexpectance
C.peoplewhojoganddietwiselywillbehealthierthanthosewhodonot
D.dietandexerciseharmratherthanbenefit health
7.AccordingtothepassagewhichofthefollowingstatementsisTRUE?
A.Joggingcandamagethebodybecauseitistootoughanexercise.
B.Dietsaresopopularbecausetheyareonthebest-sellerlists.
C.Americansnowlivetobe73yearsold.
D.ExerciseanddietaremorewidespreadinAmericathaneverbefore.
8.Itisimpliedbutnotstatedthat___________.
A.heartdiseaseisthenumberonekilleramongAmericans
B.exerciseanddietingbringaboutspiritualaswellasphysicalwell-being
C.peopledon'tstayonadietbecauseitdoesn'twork
D.a20-poundweightlosswithintwoweeksistoomuchforthebody
9.Thebesttitleforthispassageis_________