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
(1)Researchers who picked up and analyzed wild chimp droppings said on Thursday they had shown how the AIDS virus originated in
(1)Researchers who picked up and analyzed wild chimp droppings said on Thursday they had shown how the AIDS virus originated in
admin
2019-03-25
20
问题
(1)Researchers who picked up and analyzed wild chimp droppings said on Thursday they had shown how the AIDS virus originated in wild apes in Cameroon and then spread in humans across Africa and eventually the world. Their study, published in the journal Science, supports other studies that suggest people somehow caught the deadly human immunodeficiency virus (HIV)from chimpanzees, perhaps by killing and eating them.
(2)"It says that the chimpanzee group that gave rise to HIV... this chimp community resides in Cameroon," said Beatrice Hahn of the University of Alabama, who led the study. "But that doesn’t mean the epidemic originated there because it didn’t," Hahn, who has been studying the genetic origin of HIV for years, said in a telephone interview.
(3)"We actually know where the epidemic took off. The epidemic took off in Kinshasa, in Brazzaville." Kinshasa is in the Democratic Republic Congo, formerly Zaire, and faces Brazzaville, in Congo, across the Congo River. Studies have traced HIV to a man who gave a blood sample in 1959 in Kinshasa, then called Leopoldville. Later analysis found the AIDS virus.
(4)In people, HIV leads to AIDS but chimps have a version called simian immune deficiency virus: (SIV)that causes them no harm. Humans are the only animals naturally susceptible to HIV. AIDS was only identified 25 years ago. The virus now infects 40 million people around the world and has killed 25 million. Spread in blood, sexual contact and from mother to child during birth or breastfeeding, HIV has no cure and there is no vaccine, although drug cocktails can control it.
(5)And like so many new infections, AIDS appears to have been passed to humans from animals they slaughtered. SIV has been found in captive chimps but Hahn wanted to show it could be found in the wild too. Her international team got the cooperation of the government in Cameroon and they hired skilled trackers.
(6)"The chimps in that area are hunted. It’s certainly impossible to see them. It is hard to track them and find these materials," she said. But the trackers managed to collect 599 samples of droppings. Hahn’s lab found DNA, identified each individual chimp and then found evidence of the virus.
(7)"We went to 10 field sites and we found evidence of infection in five. We were able to identify a total of 16 infected chimps and we were able to get viral sequences from all of them," Hahn said. Up to 35 percent of the apes in some communities were infected. Not only that, they could find different varieties, called clades, of the virus.
(8)"We found some of the clades were really, really very closely related to the human virus and others were not," she said. Chimps separated by a river were infected with different clades, Hahn said. And a river may have carried the virus into the human population. "So how do you get from southern Cameroon to the Democratic Republic of Congo?" Hahn asked. "Some human must have done so. There is a river that goes from that southeastern corner of Cameroon down to the Congo River."
(9)Ivory and hardwood traders used the Sangha River in the 1930s, when the original human-to-human transmission is believed to have happened. Hahn’s study suggests the virus passed from chimpanzees to people more than once. "We don’t really know how these transmissions occurred," Hahn said.
(10)"We know that you don’t get it petting a chimp, or from a toilet seat, just like you can’t get HIV from a toilet seat. It requires exposure to infected blood and infected body fluids. So if you get bitten by an angry chimp while you are hunting it, which could do it."
(11)Hahn’s study only applies the HIV group M, which is the main strain of the virus responsible for the AIDS pandemic. "It’s quite possible that still other (chimpanzee SIV)lineages exist that could pose risks for human infection and prove problematic for HIV diagnostic and vaccines," her team wrote.
From the description in the passage, we learn that_____.
选项
A、monkeys are also susceptible to HTV
B、AIDS has killed 25 million people in the last 25 years
C、vaccine has been developed to prevent AIDS
D、AIDS can be cured by drug cocktails
答案
B
解析
从第4段第3句和第4句可得知B与其对应,为正确答案。
转载请注明原文地址:https://jikaoti.com/ti/FfvMFFFM
0
专业英语八级
相关试题推荐
Acommonusewithgoldinthenineteenthcenturywasasastandardforthevalueofmoney.
FiveGoldenRulesforGivingAcademicPresentationsAcademicpresentationsaredifferentfromtheclassroompresentationsthats
TenBadListeningHabitsI.CallingtheSubjectDull—Goodlistenerswillhuntforsomething【T1】_____【T1】______II.【T2】______th
CulturalCharacteristics&WebsitesI.HighandlowcontextculturesA.High-contextcommunication:dependonfactors【T1】_____:【
择书比择友简单得多。不善辞令、厌恶应酬的人,可以自由自在地徜徉于书林之中,游目四顾,俯拾皆友。看书,可以博览,可以细嚼,没有人会怪你喜新厌旧,也没有人要求你从一而终。你大可以从一本换到另一本,喜爱的书,不妨一读再读;不耐看的书,又可随手抛下,谁也
PASSAGETWOParas.4-6proposethreemainpreceptsforthenewapproach.PleaseuseONEphrasetosummarizeeachofthethreep
"Almostuniversally,womenhavefailedtoreachleadingpositionsinmajorcorporationsandprivatesectororganizations,resp
Whatwasthefirstlanguage?Howdidlanguagebegin,andwhereandwhen?Untilrecently,asensiblelinguistwouldlikelyto【S1】
ThehistoryofindigenouseducationprovisionthroughoutAustralia’sremoteareasisrepletewithinstancesofneglect,infras
随机试题
慢性支气管炎1周内咳喘痰加剧者,为
疣状癌最常发生于
静载试验后,结构承载性能分析主要包括()。(检测员不考)
【2017年真题】PFI融资方式与BOT融资方式的相同点是()。
按照记账凭证的用途,可分为()。
在上海证券交易所大宗交易的意向申报中,申报方数量不明确的,将视为至少愿以大宗交易单笔买卖()成交。
一般来说,在利率将上调的预测下,在长期国债和短期国债中,人们会倾向于投资()。
()在法治实施体系中具有基础性的意义。
在本届羽毛球公开赛上,如果中国队的女子双打能够进入半决赛,同时混合双打失利,则男子单打或者女子单打无法夺冠。如果以上命题为真,再加上以下哪项前提,可以得出结论:中国队的女子双打没有进入半决赛?
Althoughnocompanyismentionedbyname,itisveryclearwhichAmericaninternetgianttheEuropeanParliamenthasinmindin
最新回复
(
0
)