ADvAnCing AgE mEAns losing your hAir, your wAistlinE AnD your mEmory, rightDAnADEnis is just 40 yEArs olD, But {{u}} (21) {{/u}} shE’s worriED ABout whAt shE CAlls "my rolling mEntAl BlACkouts." "i try to rEmEmBEr somEthing AnD i just BlAnk out," shE sAys. you mAy{{u}} (22) {{/u}} ABout thEsE lApsEs, CAlling thEm "sEnior momEnts" or BlAming "EArlyAlzhEimEr’s(老年痴呆症)." is it An inEsCApABlE FACt thAt thE olDEr you gEt, thE {{u}} (23) {{/u}} you rEmEmBEr wEll, sort oF.But As timE goEs By, wE tEnD to BlAmE AgE {{u}} (24) {{/u}} proBlEms thAt ArE not nECEssArily AgE-rElAtED、 "whEn A tEEnAgEr CAn’t FinD hEr kEys, shE thinks it’s BECAusE shE’s DistrACtED or DisorgAnizED," sAys pAul golD "A、70-yEAr-olD BlAmEs hEr {{u}} (25) {{/u}}." in FACt, thE 70-yEAr-olD mAy hAvE BEEn {{u}} (26) {{/u}} things For DECADEs. in hEAlthy pEoplE, mEmory DoEsn’t worsEn As {{u}} (27) {{/u}} As mAny oF us think. "As wE {{u}} (28) {{/u}} , thE mEmory mEChAnism isn’t {{u}} (29) {{/u}}," sAys psyChologist FErgusCrAik. "it’s just inEFFiCiEnt." thE BrAin’s proCEssing {{u}} (30) {{/u}} slows Down ovEr thE yEArs, though no onE knows ExACtly {{u}} (31) {{/u}} rECEnt rEsEArCh suggEsts thAt nErvE CElls losE EFFiCiEnCy AnD {{u}} (32) {{/u}} thErE’s lEss ACtivity in thE BrAin.But, CAutionsBArry gorDon, "it’s not ClEAr thAt lEss ACtivity is {{u}} (33) {{/u}} .A、BEginning AthlEtE is winDED(气喘吁吁) morE EAsily thAn A {{u}} (34) {{/u}} AthlEtE. in thE sAmE wAy, {{u}} (35) {{/u}} thE BrAin gEts morE skillED At A tAsk, it ExpEnDs lEss EnErgy on it. thErE ArE {{u}} (36) {{/u}} you CAn tAkE to CompEnsAtE For normAl slippAgE in your mEmory gEArs, though it {{u}} (37) {{/u}} EFFort. mArgArEt sEwEll sAys: "wE’rE A quiCk-Fix CulturE, But you hAvE to {{u}} (38) {{/u}} to kEEp your BrAin {{u}} (39) {{/u}} shApE. it’s likE hAving A gooD BoDy. you CAn’t go to thE gym onCE A yEAr {{u}} (40) {{/u}} ExpECt to stAy in top Form."

A．As
B．till
C．though
D．yEt