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
When Did Aids Begin? The year was 1959. Location: the central African city of Leopoldville, now called Kinshasa, shortly bef
When Did Aids Begin? The year was 1959. Location: the central African city of Leopoldville, now called Kinshasa, shortly bef
admin
2022-05-07
44
问题
When Did Aids Begin?
The year was 1959. Location: the central African city of Leopoldville, now called Kinshasa, shortly before the waves of violent rebellion that followed the liberation of the Belgian Congo. A seemingly healthy man walked into a hospital clinic to give blood for a Western backed study of blood diseases. He walked away and was never heard from again. Doctors analyzed his sample, froze it in a test tube and forgot about it. A quarter century later, in the mid-1980s, researchers studying the growing AIDS epidemic took a second look at the blood and discovered that it contained HIV, the virus that causes AIDS.
And not just any HIV. The Leopoldville sample is the oldest【C21】________of the AIDS virus ever isolated and may now help solve the【C22】________of how and when the virus made the leap from animals (moneys or chimpanzees) to【C23】________, according to a report published last week in Nature. Dr. David Ho,【C24】________of the Aaron Diamond AIDS Research Center in New York City and【C25】________of the study’s samples, says DNA pushes the putative origin of the AIDS【C26】________back at least a decade, to the early "50s over even the "40s.
Over the【C27】________15 years, scientists have identified at least 10 subtypes of the【C28】________virus. But they couldn’t tell whether they were seeing【C29】________on one changeable virus or the handiwork of several【C30】________viruses that had made the jump from primates to man. A【C31】________look at the genetic mutations in the Leopoldville sample strongly【C32】________that all it took to launch the AIDS epidemic was one unlucky【C33】________of events.
By comparing the DNA of the 1959 virus with that of【C34】________taken from the "80s and "90s, Ho and his【C35】________constructed a viral family tree in which the Leopoldville isolate sits right【C36】________the juncture where three subtypes branch out. The 39-year-old【C37】________is also strikingly similar to the other seven subtypes. The clear implication: all the viral【C38】________can be traced back to a single event or a closely related group of【C39】________. One theory is that AIDS started through contact with infected monkeys in a【C40】________area and spread to the rest of the population through urbanization and mass inoculations.
The findings underscore how rapidly HIV can adapt to its surroundings, making it devilishly difficult to develop effective vaccines. No one knows how many more subtypes of HIV will sprout in the next 40 years, but chances are they will be every bit as lethal as the ones we see today, if not more so.
【C33】
选项
答案
turn
解析
转载请注明原文地址:https://kaotiyun.com/show/6YMO777K
本试题收录于:
CATTI二级笔译综合能力题库翻译专业资格(CATTI)分类
0
CATTI二级笔译综合能力
翻译专业资格(CATTI)
相关试题推荐
RichDiseasesinPoorCountriesNon-communicablediseasesusedtobearich-worldproblem.Atthattime,peopleinpoorcount
RichDiseasesinPoorCountriesNon-communicablediseasesusedtobearich-worldproblem.Atthattime,peopleinpoorcount
RichDiseasesinPoorCountriesNon-communicablediseasesusedtobearich-worldproblem.Atthattime,peopleinpoorcount
RichDiseasesinPoorCountriesNon-communicablediseasesusedtobearich-worldproblem.Atthattime,peopleinpoorcount
RichDiseasesinPoorCountriesNon-communicablediseasesusedtobearich-worldproblem.Atthattime,peopleinpoorcount
CountriesontheAfricancontinentcanswiftlytacklechallenges.
Accordingtothespeaker,howmanypoundsofthebeefproductswererecalledonTuesday?
Accordingtothespeaker,howmanypoundsofthebeefproductswererecalledonTuesday?
Formostofhumanhistory,traveltodistantlocationswasadifficultprocess.
Popularsitesarecalledtouristattractions.
随机试题
产褥期内分泌的变化错误的是()
李女士,29岁,下楼时不慎扭伤踝关节,1h后来院就诊,护士应采取
艾滋病健康教育的目标人群包括
具有推动和调控各脏腑、经络、形体和官窍生理活动功能的气是()
土地侵权民事责任的形式有()等。
用人单位实施裁员时,应当依据劳动合同法优先留用的人员是()。
宪法是一个国家的根本大法,具有至高无上的地位。环顾世界各国的宪法的产生和发展历程,其又呈现出各自不同的发展轨迹和特点。下列有关世界主要国家的宪法的发展与历史的表述不正确的是()。
Perhapsthemostvaluableresultofalleducationistheabilitytomakeyourselfdothingsyouhavetodo,whentheyoughttob
多个软件工程师合作开发一个项目,各开发者之间需要两两互相通信。假设每一条通信路径的开销为200LOC/年(LOC为代码行数)。设有4名软件工程师,如果单独工作,每个人的生产率是6000 LOC/年,那么由这4名软件工程师组成的项目组的生产率为(89)。在这
FewAmericansstayinonepositionoroneplaceforalifetime.Wemovefromtowntocityto【T1】______,fromajobinoneregio
最新回复
(
0
)