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
The following paragraphs are given in a wrong order. You are required to reorganize these paragraphs into a coherent text by cho
The following paragraphs are given in a wrong order. You are required to reorganize these paragraphs into a coherent text by cho
admin
2009-04-26
68
问题
The following paragraphs are given in a wrong order. You are required to reorganize these paragraphs into a coherent text by choosing from the list A—G. The first and the last paragraphs have been placed for yous.
A. 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.
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. 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?
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: G is the first paragraph and F is the last.
选项
答案
C
解析
转载请注明原文地址:https://kaotiyun.com/show/4ei4777K
0
考研英语一
相关试题推荐
Animportantfactorofleadershipisattraction.Thisdoesnotmeanattractivenessintheordinarysense,forthatisabornqua
JohnDeweybelievedthateducationshouldbeapreparationforlife,thatapersonlearnsbydoing,andthatteachingmust_____
WhichofthefollowingbestdescribestheAmerica’seconomicsituation?Howdoesmonetarypolicyofferhelpforweakeconomica
Nameshavegainedincreasingimportanceinthecompetitiveworldofhighereducation.Ascollegesstriveformarketshare,they
Leadingdoctorstodayweighinonthedebateoverthegovernment’sroleinpromotingpublichealthbydemandingthatministersi
Whenitcomestotheeconomy,pessimismisinandgoodoldAmericanoptimismisout.Fromtheheadlinesinthenewspaperstothe
OlympicGamesareheldeveryfouryearsatadifferentsite,inwhichathletes【1】differentnationscompeteagainsteachotherin
Everyone,itseems,hasahealthproblem.AfterpouringbillionsintotheNationalHealthService,Britishpeoplemoanaboutdir
Inthefirstyearsofthe21stcentury,noareaoftheAmericaneconomyhasexcitedmoreemotionthanthepropertymarket.First
随机试题
人在对自己行为的自觉调节方式和水平方面的性格特征是( )。
患者,男性,60岁。咳嗽2个月,以干咳为主,有午后低热,今上午突然咯血400ml来院急诊。咯血时,患者应采取的体位是()。
(2011年)已知某城市预测年份的人口数57万人,人均用水定额为200L/d,生活污水量占用水量的90%,计算预测年份该城市的生物污水量为多少?
招标投标管理的基本原则中,()原则主要表现为要求工程招标投标具有高的透明度,使每一个投标人获得同等的信息,知悉招标的一切条件和要求。
企业通常应当采用成本模式对投资性房地产进行后续计量,满足特定条件时也可采用公允价值模式对投资性房地产进行后续计量。()
退货物流分为当场拒收和事后退货。
一次会议某单位邀请了10名专家,该单位预定了10个房间,其中一层5问、二层5问。已知邀请专家中4人要求住二层、3人要求住一层、其余3人住任一层均可。那么要满足他们的住房要求且每人1间,有多少种不同的安排方案?()
Therearehiddenfactorswhichscientistscall"feedbackmechanisms".Nooneknowsquitehowtheywillinteractwiththechangin
Exactly3depositshavebeenmadeinasavingsaccountandtheamountsofthedepositsare3consecutiveintegermultiplesof$7
A、Callafriend.B、Workonhiscar.C、Takeataxi.D、Walktowork.C词义辨析题callforacab=askforataxi
最新回复
(
0
)