首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
At 18, Ashanthi DeSilva of suburban Cleveland is a living symbol of one of the great intellectual achievements of the 20th centu
At 18, Ashanthi DeSilva of suburban Cleveland is a living symbol of one of the great intellectual achievements of the 20th centu
admin
2018-03-16
41
问题
At 18, Ashanthi DeSilva of suburban Cleveland is a living symbol of one of the great intellectual achievements of the 20th century. Bom with an extremely rare and usually fatal disorder that left her without a functioning immune system(the "bubble-boy disease" , named after an earlier victim who was kept alive for years in a sterile plastic tent), she was treated beginning in 1990 with a revolutionary new therapy that sought to correct the defect at its very source, in the genes of her white blood cells. It worked. Although her last gene-therapy treatment was in 1992, she is completely healthy with normal immune function, according to one of the doctors who treated her, W. French Anderson of the University of Southern California. Researchers have long dreamed of treating diseases from hemophilia to cancer by replacing mutant genes with normal ones. And the dreaming may continue for decades more. "There will be a gene-based treatment for essentially every disease, " Anderson says, "within 50 years. "
It’ s not entirely clear why medicine has been so slow to build on Anderson’ s early success. The National Institutes of Health budget office estimates it will spend $ 432 million on gene-therapy research in 2005, and there is no shortage of promising leads. The therapeutic genes are usually delivered through viruses that don’t cause human disease. "The virus is sort of like a Trojan horse, " says Ronald Crystal of New York Presbyterian/Weill Cornell Medical College. "The cargo is the gene.
At the University of Pennsylvania’ s Abramson Cancer Center, immunologist Carl June recently treated HIV patients with a gene intended to help their cells resist the infection. At Cornell University, researchers are pursuing gene-based therapies for Parkinson’ s disease and a rare hereditary disorder that destroys children’ s brain cells. At Stanford University and the Children’ s Hospital of Philadelphia, researchers are trying to figure out how to help patients with hemophilia who today must inject themselves with expensive clotting drugs for life. Animal experiments have shown great promise.
But somehow, things get lost in the translation from laboratory to patient. In human trials of the hemophilia treatment, patients show a response at first, but it fades over time. And the field has still not recovered from the setback it suffered in 1999, when Jesse Gelsinger, an 18-year-old with a rare metabolic disorder, died after receiving an experimental gene therapy at the University of Pennsylvania. Some experts worry that the field will be tarnished further if the next people to benefit are not patients but athletes seeking an edge. This summer, researchers at the Salk Institute in San Diego said they had created a "marathon mouse" by implanting a gene that enhances running a-bility; already, officials at the World Anti-Doping Agency are preparing to test athletes for signs of "gene doping". But the principle is the same, whether you’ re trying to help a healthy runner run faster or allow a muscular-dystrophy patient to walk. "Everybody recognizes that gene therapy is a very good idea, " says Crystal. "And eventually it’ s going to work.
Which of the following is true according to the text?
选项
A、Ashanthi needs to receive gene-therapy treatment constantly.
B、Despite the huge funding, gene researches have shown few promises.
C、Therapeutic genes are carried by harmless viruses.
D、Gene-doping is encouraged by world agencies to help athletes get better scores.
答案
C
解析
文章第二段对于基因治疗的方式的解释是用于治疗的基因通过“viruses that don’t cause human disease”进入体内,就好像“特洛伊木马”一样,由此可见,这些病毒是无害的。因此正确答案为C。
转载请注明原文地址:https://kaotiyun.com/show/xJWd777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
Howmanylanguagesareusedthroughouttheworldtoday?
Thespeakerwantsustoappreciatethatachild______.
Thespeakerwantsustoappreciatethatachild______.
ThemoleculesofcarbondioxideintheEarth’satmosphereaffecttheheatbalanceoftheEarthbyactingasaone-wayscreen.Al
Theauthorpointsoutatthebeginningthat______.Accordingtothepassage,allofthefollowingmayaffectaperson’shandedn
Throughouthistorytherehavebeenmanyunusualtaxesleviedonsuchthingsashats,beds,baths,marriages,andfunerals.At
Impatiencecharacterizesyoungintellectualworkers.Theywanttomaketheirmark(31).Soit’simportanttoget(32)tothemin
Impatiencecharacterizesyoungintellectualworkers.Theywanttomaketheirmark(31).Soit’simportanttoget(32)tothemin
随机试题
“托拉斯”是几个语素几个音节几个词?()
A.声调B.语言C.眼神D.节奏E.服饰无声的动姿指
女,2岁,发热、精神萎靡、喷嚏、干咳、眼睑浮肿、结膜充血、畏光流泪等,在某医院疑似麻疹。对该患儿的护理不正确的是
( )组织结构的长处是决策迅速、命令统一、机构简单、权责分明、组织稳定,它的不足之处是组织缺乏弹性,下级对上级绝对服从,缺乏民主,容易造成独断专行。同时由于它要求主管领导者熟悉所管辖范围的全部业务,对主管领导者在管理知识和专业技能方面要求较高。
代销期满,原股东认购股票的数量未达到拟配售数量的比例为()时,发行人应当按照发行价加算银行同期利息返还给已经认购的股东。
违反税务管理基本规定的行为有()。
NOW
【B1】【B5】
Researchershaveestablishedthatwhenpeoplearementallyengaged,biochemicalchangesoccurinthebrainthatallowittoact
关于市价指令,下列说法正确的有()。
最新回复
(
0
)