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
考研
[A]But as six years stretched to 10, then to 14, the anxiety of health officials gave way to astonishment. Although two of the r
[A]But as six years stretched to 10, then to 14, the anxiety of health officials gave way to astonishment. Although two of the r
admin
2016-11-11
34
问题
[A]But as six years stretched to 10, then to 14, the anxiety of health officials gave way to astonishment. Although two of the recipients have died from other causes, not one of the man’s contaminated blood has come down with AIDS. More telling still, the donor is also healthy. In fact his immune system remains as robust as if he had never tangled with HIV at all. What could explain such unexpected good fortune?
[B]If this speculation proves right, it will mark a milestone in the battle to contain the late-20th century’s most terrible epidemic. For in addition to explaining why this small group of people infected with HIV has not become sick, the discovery of a viral strain that works like a vaccine would have far-reaching implications. "What these results suggest," says Dr. Barney Graham of Tennessee’s Vanderbilt University, "is that HIV is vulnerable and that it is possible to stimulate effective immunity against it. "
[C]The strain of HIV that was discovered in Sydney intrigues scientists because it contains striking abnormalities in a gene that is believed to stimulate viral duplication. In fact, the virus is missing so much of this particular gene-known as nef, for negative factor—that it is hard to imagine how the gene could perform any useful function. And sure enough, while the Sydney virus retains the ability to infect T cells—white blood cells that are critical to the immune system’s ability to ward off infection—it makes so few copies of itself that the most powerful molecular tools can barely detect its presence.
[D]At the very least, the nef gene offers an attractive target for drug developers. If its activity can be blocked, suggests Deacon, researchers might be able to bring the progression of disease under control, even in people who have developed full-blown AIDS. The need for better AIDS-fighting drugs was underscored last week by the actions of a U. S. Food and Drug Administration advisory panel, which recommended speedy approval of two new AIDS drugs. Although FDA commissioner David Kessler was quick to praise the new drugs, neither medication can prevent or cure AIDS once it has taken hold. What scientists really want is a vaccine that can prevent infection altogether. And that’s what makes the Sydney virus so promising-—and so controversial.
[E]A team of Australian scientists has finally solved the mystery. The virus that the donor contracted and then passed on, the team reported last week in the journal Science, contains flaws in its genetic script that appear to have rendered it harmless. "Not only have the recipients and the donor not progressed to disease for 15 years," marvels molecular biologist Nicholas Deacon of Australia’s Macfarlane Burnet Centre for Medical Research, "but the prediction is that they never will. " Deacon speculates that this "impotent" HIV may even be a natural inoculant that protects its carriers against more virulent strains of the virus.
[F]But few scientists are enthusiastic about testing the proposition by injecting HIV—however weakened—into millions of people who have never been infected. After all, they note, HIV is a retrovirus, a class of infectious agents known for their alarming ability to integrate their own genes into the DNA of the cells they infect. Thus once it takes effect, a retrovirus infection is permanent.
[G]About 15 years ago, a well-meaning man donated blood to the Red Cross in Sydney, Australia, not knowing he has been exposed to HIV-1, the virus that causes AIDS. Much later, public health officials learned that some of the people who got transfusions containing his blood had become infected with the same virus: presumably they were almost sure to die.
Order:
选项
答案
E
解析
该题前一个段落最后一句话提出一个问题:这种意外的好运该如何解释?那么本段应该就其现象进行解释,E项“一批澳大利亚科学家终于揭开了谜团……”符合本段题意。
转载请注明原文地址:https://kaotiyun.com/show/EWoZ777K
0
考研英语一
相关试题推荐
For10yearsIhavebeenteachinganimalbehaviorandconservationbiologyattheBoulderCountyJailinColorado.Thecourse—pa
PublichealthofficialsgrapplingwiththeobesityepidemichavedebatedawiderangeofapproachestohelpingslimtheAmerican
Newspapersarebecomingmorebalancedbusinesses,withahealthiermixofrevenuesfromreadersandadvertisers.Americanpapers
Thedestructionofournaturalresourcesandcontaminationofourfoodsupplycontinuetooccur,largelybecauseoftheextreme
Telecommuting,Internetshoppingandonlinemeetingsmaysaveenergyascomparedwithin-personalternatives,butasthedigital
IntheUnitedStates,thefirstdaynursery,wasopenedin1854.Nurserieswereestablishedinvariousareasduringthe【C1】_____
IntheUnitedStates,thefirstdaynursery,wasopenedin1854.Nurserieswereestablishedinvariousareasduringthe【C1】_____
IntheUnitedStates,thefirstdaynursery,wasopenedin1854.Nurserieswereestablishedinvariousareasduringthe【C1】_____
IntheUnitedStates,thefirstdaynursery,wasopenedin1854.Nurserieswereestablishedinvariousareasduringthe【C1】_____
随机试题
反映企业财务状况和经营成果的书面文件称为
是施工阶段投资控制的内容
竖向承载水泥土搅拌桩、旋喷桩复合地基竣工验收时,承载力检验应采用()。
纳税人在承担税法规定的义务的同时,也享有相应的权利。下列各项中,属于纳税义务人享有的权利的有()。
下列文物不是曾侯乙墓出土的是()。
以下提法中,()不是培训需求的对象分析和阶段分析。
关于香港特别行政区司法机关,下列表述正确的是()。(2018单15、2018法单10)
阅读材料,并回答问题。实践证明,“文化大革命”不是也不可能是任何意义上的革命或社会进步。它根本不是“乱了敌人”而只是乱了自己,因而始终没有也不能由“天下太乱”达到“天下大治”。在我国,在人民民主专政的国家政权建立以后,尤其是社会主义改造基本完成、剥削阶级
设A、B为3阶相似非零实矩阵,矩阵A=(αij)满足aij=Aij(i,j=1,2,3),Aij是aij的代数余子式,矩阵B满足|E+2B|=|E+3B|=0,则矩阵A*+E可逆,方程组(B-E)x=0没有非零解.
ThemostthoroughlystudiedintellectualsinthehistoryoftheNewWorldaretheministersandpoliticalleadersofseventeenth
最新回复
(
0
)