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
You are going to read a list of headings and a text about unknown knowledge on AIDS. Choose the most suitable heading from the l
You are going to read a list of headings and a text about unknown knowledge on AIDS. Choose the most suitable heading from the l
admin
2009-04-27
23
问题
You are going to read a list of headings and a text about unknown knowledge on AIDS. Choose the most suitable heading from the list for each numbered paragraph. The first paragraphs of the text are not numbered. There is one extra heading which you do not need to use.
In the 20 years since the first cases of AIDS were detected, scientists say they have learned more about this viral disease than any other.
Yet Peter Piot, who directs the United Nations AIDS program, and Stefano Vella of Rome, president of the International AIDS Society, and other experts say reviewing unanswered questions could prove useful as a measure of progress for AIDS and other diseases.
Among the important broader scientific questions that remain:
(41)______.
A long-standing belief is that cancer cells constantly develop and are held in check by a healthy immune system. But AIDS has challenged that belief. People with AIDS are much more prone to certain cancers like non-Hodgkins lymphomas and Kaposi’s sarcoms, but not to breast, colon and lung, the most common cancers in the United States. This pattern suggests that an impaired immune system, at least the type that occurs in AIDS, does not allow common cancers to develop.
(42)______.
When HIV is transmitted sexually, the virus must cross a tissue barrier to enter the body. How that happens is still unclear. The virus might invade directly or be carried by a series of different kinds of cells.
Eventually HIV travels through lymph vessels to lymph nodes and the rest of the lymph system. But what is not known is how the virus proceeds to destroy the body’s CD-4 cells that are needed to combat invading infectious agents.
(43)______.
Although HIV kills the immune cells sent to kill the virus, there is widespread variation in the rate at which HIV infected people become ill with AIDS. So scientists ask: Can the elements of the immune system responsible for that variability be identified? If so, can they be used to stop progression to AIDS in infected individuals and possibly pre vent infection in the first place?
(44)______.
In theory, early treatment should offer the best chance of preserving immune function. But the new drugs do not completely eliminate HIV from the body so the medicines, which can have dangerous side effects, will have to be taken for a lifetime and perhaps changed to combat resistance. The new policy is expected to recommend that treatment be deferred until there are signs the immune system is weakening.
Is a vaccine possible?
There is little question that an effective vaccine is crucial to controlling the epidemic. Yet only one has reached the stage of full testing, and there is wide controversy over the degree of protection it will provide. HIV strains that are transmitted in various areas of the world differ genetically. It is not known whether a vaccine derived from one type of HIV will confer protection against other types.
(45)______.
Without more incisive, focused behavioral research, prevention messages alone will not put an end to the global epidemic.
A. What route does HIV take after it enters the body to destroy the immune system?
B. How and when did the long-standing belief concerning AIDS and HIV crop up?
C. What is the most effective anti-HIV therapy?
D. How does HIV subvert the immune system?
E. In the absence of a vaccine, how can HIV be stopped?
F. Why does AIDS predispose infected persons to certain types of cancer and infections?
选项
答案
D
解析
本题考查通过辨析理解段落主题句和段落中的特殊句式(本段中的特殊句式是疑问句)来归纳中心主旨内容的能力。本段中出现的"HIV"和"immune system"暗示选项D是正确答案,因为该选项涉及到了上述词语,另外原文中的"kill"等同于"subvert"一词。
转载请注明原文地址:https://jikaoti.com/ti/bIURFFFM
0
考研英语一
相关试题推荐
IsitanywonderthatAmericaisalsoacountryofdangerouslyoverweightpeople?AccordingtoarecentstudybytheNational
IsitanywonderthatAmericaisalsoacountryofdangerouslyoverweightpeople?AccordingtoarecentstudybytheNational
[A]Thepossibilitytoincreaseyourgutmicrobiota[B]Scientist’sopiniontowardsthefoodvalue[C]Theindispensabler
Likeatiredmarriage,therelationshipbetweenlibrariesandpublishershaslongbeenreassuringlydull.E-books,however,are
Runningmaybethesinglemosteffectiveexercisetoincreaselifeexpectancy,accordingtoanewreviewandanalysisofpastre
HeartdiseasehaslongbeenBritain’sbiggestsinglekiller.Despiteoureffortstowardoffitsriskfactorswithmoreexercise
ReadthefollowingtextandanswerthequestionsbychoosingthemostsuitablesubheadingfromthelistA-Gforeachnumberedpa
Beingagoodparentis,ofcourse,whateveryparentwouldliketobe.Butdefiningwhatitmeanstobeagoodparentisundoubt
[A]Theyfocusattentionmainlyonthemselves[B]Theytreatyourpropertylikeit’stheirown[C]Theycan’tacceptyout
ThethirdsentenceofParagraph1impliesthat______.InParagraph5",thepowerless"probablyrefersto______.
随机试题
尿脱落细胞学检查适用于
最适合于转移性、复发性嗜铬细胞瘤定位诊断的检查方法是
去甲肾上腺素的不良反应有()
世界银行将工程造价的构成划分为()。
关于工程造价管理工作要素,下列叙述正确的有( )。
一个人从家到公司,当他走到路程一半的时候,速度下降了10%,问:他走完全程所用时间的前半段和后半段所走的路程比是()。
①___________目前对于地球磁场的变化和倒转提出了不少理论或模型,___________基本上都处在假设和推测的阶段,并没有一个十分成熟的理论。②在评价标准上,___________看数字,___________不能只看数字,要防止“干部出数字”
【B1】【B4】
设f(x)为奇函数,且f’(1)=2,则f(x3)|x=-1=________.
十进制整数127转换为二进制整数等于()。
最新回复
(
0
)