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
2017-02-25
19
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 (HTV) 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 HIV
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://kaotiyun.com/show/SO7O777K
0
专业英语八级
相关试题推荐
ManystudentsarerelyingonInternetandothertechnologiesfortheirlanguagestudy,andthistrendisnotonlyrecognizedbut
Language-basedlearningdisabilitiesareproblemswithage-appropriatereading,spelling,and/orwriting.Thisdisorderisnot
Language-basedlearningdisabilitiesareproblemswithage-appropriatereading,spelling,and/orwriting.Thisdisorderisnot
Educationistheprocessoflearningandknowing,whichisnotrestrictedtoourschooltext-books.Itisaholisticprocessan
AmongthefiveGreatLakes,whichoneiswhollywithintheUnitedStates?
Somepeoplethinkthatuniversitiesshouldputthesameamountofmoneyintostudents’sportactivitiesastotheirlibraries.W
ForMrs.Saxby,theresumeisall-important,becauseit
HowtoPracticeEsperanto?Thereareatleast1,000,000Esperantospeakersworldwidefromover100countriesandtheycomefrom
WhenGov.ArnoldSchwarzeneggerannouncedthefinalcutstoanalreadypain-pepperedCaliforniabudgetinJuly,oneofthemost
Inlastweek’sTribune,therewasaninterestingletterfromMr.J.StewartCook,inwhichhesuggestedthatthebestwayofavo
随机试题
当发生中断事件但_______时,硬件就暂时不响应该中断,待屏蔽标志消除时再响应。
澳大利亚A公司、德国B公司与中国C公司,谈判在中国合作投资滑石矿事宜,中方C公司欲控制出口货源,但又不能为该合作投入现金,只想用人力与无形资产投入。A公司和B公司代表来华欲参观考察矿山,C公司积极派人配合并陪同前往,整个日程安排周到,准备有效,在
女性,58岁,绝经7年,近3个月阴道流水样白带,近2周出现阴道间断少量血性排液。妇检:宫颈光滑,宫体稍大且软,双侧附件未扪及异常最有确诊价值的方法是
依据课税对象的性质,关税属于()。
有()情形之一的,当事人可以解除合同。
如果清偿因或有事项而确认的负债所需支出全部或部分预期由第三方或其他方补偿,则对于补偿金额的处理,下列法中正确的是()。
我国保留的古老稀有孑遗树种有()。
年轻同志由于某些原因,引起群众不满意,你有什么建议?
已知非空链表A,其指针是list,链表中的结点由两部分组成:数据域data和指针域link。设计一个算法,将链表中数据域值最小的那个链结点移到链表的最前面,在不额外申请新的链结点的情况下,使得算法时间复杂度和空间复杂度尽可能低。要求:根据设计思想,采用
A、It’stoobroadtocopewith.B、It’sabitoutdated.C、It’scontroversial.D、It’soflittlepracticalvalue.A
最新回复
(
0
)