阅读理解
Alzheimer’sdisease(早老性痴呆病)isamajornationalhealthproblem．Nearly2millionAmericansovertheageof65haveAlzheimer’sdisease．Itisaleadingcauseofdeathamongtheelderly．ButAlzheimer’sdiseaseisnotconfined(限于)totheaged．Theremaybeamillionormorepeopleundertheageof65sufferingfromthedisease．
Atonetime．peoplesufferingfromthediseaseweresaidtobe“gettingold”．ThediseasewasthoughttobeanaturalpartofgrowingoldbutitisnowknownthatAlzheimer’sdiseasestrikesyoungandoldalike．Itisanorganicdiseasethatdestroysbraincells．
Alzheimer’sdiseaseaffectsthepatient’smemoryspeechandmovement．Inthebeginningstagesofthediseasethepatientmayseemslightlyconfused．Hemayhavetroubleinspeaking．
Thenthepatient’smemorybeginstofail．Hemayforgetdatestelephonenumbersnamesandplans．
Asthediseaseprogresses．thepatientmaynotrecognizehisfamilyandfriends．Thesesymptoms(症状)oftencauseterribleanxietyinthepatient．Hemayfeellostandfrightened．Sometimesthepatientreactswithwildandbadbehavior．
Inthelaststagesofthedisease．thepatientmaynotbeabletotakecareofhimself．Hemayhavelosttheabilitytospeakandwalk．
Scientistsdon’tknowexactlywhatcausesAlzheimer’sdisease．Itmaybecausedbyavirusorapoisonoussubstanceintheenvironment．Atpresentthereisnocureforthedisease．Buttherearewaystoslowitsprogress．Exerciseandphysicaltreatmentcanhelpthepatientsofthisdisease．
(1)
A．
isaterriblepartoftheagingprocess
B．
isanorganicdiseasethataffectsyoungandold
C．
canbecuredbyphysicaltreatment
D．
causesforgetfulness