Theremayalsobeothertargetsnotyetexploredthataffectagingandneuromuscularfunction.SaidKornfeld:“Theprocessofagingremainsmysterious.”
A.ButKomfeldsaidscientistswillnotknowabouttheapplicabilityofthedrugsinhumansuntilasimilarstudyisdoneonhumans.“What’sveryencouragingisthatthesedrugsweredevelopedtotr eathumans,andtheyarewellunderstood,becausethey’vebeenusedforalongtime,”hesaid。
B.Laterthescientistsdiscoveredthattworelatedanticonvulsantd rugsalsolengthenedthelivesoftheworms-inthecaseofonedrug,byalmost50percent.“Thiswasabigsurprisetouse,Komfeldsaid.”“Wedidn’tthinkanticonvulsantd rugshadanyparticularrelationshiptoaging.Thatconnectionwascompletelyunexpected.”
C.Roundwormsareapoorsubjectforexperiments,becausetheyarenotlikehumans,eventhoughtheirmoleculesaresimilar.Forexample,theyhavenobones,nordotheyshowemotions,makingitd ifficulttoknowhowexactlyhumansubjectswouldreacttothesedrugsinlargequantities.However,usingthewormsallowsexperimentstobeconductedquickly,becausetheydonotliveforlong。
D.“Somehowtheneuralactivityseemstoregulatetheagingofallofthebodytheskin,musculature,andreproductivetr act,”Kornfeldsaid.“Somehowthenervoussystemcoordinatestheprogressofallthesetissues,evidently,thoughthelifestages.Butwedon’tknowhowitd oesthat.”
E.Thediscoverymayalsoshedlightonthelittle-understoodagingprocess.Sincethedrugsactontheneuromuscularsystemsofbothhumansandworms,thefindingshintatalinkbetweenneuralactivityandaging。
F.Unlikevertebrates,thewormsareidealsubjectsforthestudyofagingbecauseoftheirshortlifespans,whichlastonlyacoupleofweeksinalaboratory.Thewormiswellknowningenetics,andtheworm’sgenomehasbeensequenced。
G.Useofthisdrughasbeenpermittedbylawsince1998andwideruseisnowexpectedasaresultofthestudies.“Wecanclearlylinkthisdrugwithhumanaging,butwestillneedtofindproof,saysKornfeldoptimistically.”
正确答案：D空前文字提到了另一个问题：神经肌肉活动与延缓衰老的问题;只有选项D继续提到了这个问题，所以选D。
选项C：该选项指出：“蛔虫实际上并不是理想的实验对象，因为蛔虫不是人类，尽管两者分子结构相同。”显然，这个选项与原文主旨完全背离。连实验对象都是错误的话，文章的结论就更加不可能是正确的。这个选项应该排除。
选项G：该选项指出：“这种药物已经用于延缓人类衰老了，虽然还需要更多的证据来证明这种药物真的会起作用”。这种论点显然是不对的;没有做过实验怎么能够就冒然使用呢?而且与文中提到的“目前还没有在人类身上做实验”这一点完全相左。这个选项也是明显的干扰选项。
