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 realization that colds can kill has renewed interest in finding vaccines and treatments. The trouble is that the common cold
The realization that colds can kill has renewed interest in finding vaccines and treatments. The trouble is that the common cold
admin
2019-09-30
66
问题
The realization that colds can kill has renewed interest in finding vaccines and treatments. The trouble is that the common cold is caused not by one virus but by hundreds of different ones. This means a vaccine or drug that works a-gainst one of these viruses, or one family of viruses, is usually ineffective against all the others. What’s more, because colds are usually so mild, if treatments cause even minor side effects they can be worse than the disease. Such treatments will never get approval for general use, which is why most companies instead focus on drugs that relieve symptoms.
Nevertheless, some drugs and vaccines are being developed against the cold viruses most likely to
turn nasty
. A vaccine against Respiratory Syncytial Virus(RSV), a virus which can cause serious illness in young children and the elderly, is going through clinical trials. It consists of a weakened strain of the virus given as a nasal spray.
A treatment for RSV infections, based on RNA interference, is also in development. However, treatments for specific viruses are useless unless your cold is caused by the virus in question—and doctors have no quick way to work out which virus is to blame for a cold. Systems to do this are under development, mostly based on looking for specific DNA or RNA sequences, but none are near to reaching the market.
An alternative approach would be to keep taking drugs that prevent infection throughout the cold season, such as a derivative of the anti-smallpox drug cidofovir which has been shown to combat adenoviruses, viruses that can cause upper respiratory infections. But again, as adenoviruses are only responsible for a few percent of colds, the benefits hardly justify the expense and risk of side effects from remaining on a drug permanently.
Short of everyone on the planet isolating themselves for two or three weeks, so existing cold viruses run out of hosts and die out, it is hard to see how we can ever defeat the common cold. Even then, new cold viruses would evolve in time from animal viruses. Some even question whether it is desirable to try to eliminate colds. "It’s blind speculation," says Joel Weinstock of Tufts University in Boston in the US, "but the common cold may protect us from more serious viruses." An occasional sniffle might be a price worth paying if it keeps our immune defenses primed.
It could be inferred from the third paragraph that
选项
A、specific DNA or RNA sequences are developed to detect the viruses.
B、it is not a quick way to look for DNA sequences.
C、systems to detect viruses are working to enter the market.
D、treatments for some specific virus are successful.
答案
D
解析
推理判断题。根据题干定位到第三段。其中讲到治疗特定病毒的药物丝毫不起作用。除非感冒是由被怀疑病毒所致,故D项正确,表示针对某些特定病毒的治疗是有效的。
转载请注明原文地址:https://kaotiyun.com/show/Oee4777K
0
考研英语二
相关试题推荐
ThewriterwarnsAmericansthat______.By"commonresources"(Paragraph2),theauthormeansthat______.
Ifbusinessmenaretaxedtoomuch,theywillnolongerbe______toworkhard,withtheresultthattaxrevenuesmightactually
Accordingtothepassage,thefactthatyoungpeopleseemtobelosinginterestinscience______.Whichofthefollowingstate
Accordingtothepassage,thefactthatyoungpeopleseemtobelosinginterestinscience______.Thesecondparagraphismain
Sportisheadingforanindissolublemarriagewithtelevisionandthepassivespectatorwillenjoyaprivateparadise.Allofth
Mosthumanbeingsactuallydecidebeforetheythink.Whenanyhumanbeing—executive,specializedexpert,orpersoninthestreet
TheInternetaffordsanonymitytoitsusers,ablessingtoprivacyandfreedomofspeech.Butthatveryanonymityisalsobehind
Priortothe20thcentury,manylanguageswithsmallnumbersofspeakerssurvivedforcenturies.Theincreasinglyinterconnected
Priortothe20thcentury,manylanguageswithsmallnumbersofspeakerssurvivedforcenturies.Theincreasinglyinterconnected
Despiteyourbestintentionsandefforts,itisinevitable:Atsomepointinyourlife,youwillbe【C1】______.Mistakescanbeh
随机试题
下列关于地铁车站结构施工质量控制的主要措施,说法错误的是()。
某企业对某天24小时生产的某种产品进行质量检验,采用整群抽样的方法,每隔1小时抽取1分钟生产的产品进行检验。检验结果为:合格率为95%,群间方差为O.01。试在可靠程度为95.45%的保证下,推断全天生产产品合格率的范围。(注:t=2)
某工程项目招标过程中,甲投标人研究招标文件后,以书面形式提出质疑问题,招标人对此问题给予了书面解答,则该解答()
关于我国现行建设工程招标投标的说法,正确的是()。
开证银行授权代付行向受益人预付信用证金额的全部或一部分,由开证行保证偿还并负担利息的信用证为()。
12月9日,中国家庭金融调查公布2010年中国家庭的基尼系数为0.61,高于2010年世界基尼系数平均的0.44。以下措施不能缩小基尼系数的是()。
大兴安岭的香菇远销日韩等地.香菇上市时刘经理到当地按市场价格10元/下克收购了2000千克香菇存入冷库。预测香菇的市场价每天每千克将上涨0.5元,而冷库存放香菇每天需要支出各种费用合计340元.且香菇在冷库中最多保存110天,同时平均每天有6千克的香菇腐烂
A:Couldyouspareafewhourstohelpmecleanthehouse?B:______.
拿破仑帝国的对内政策充分显示了当时法国资产阶级的主要愿望是()
有以下程序main(){inta=1,b=2,c=3,d=0;if(a==1&&b++=2)if(b!=2‖c-!=3)printf("%d,%d,%d\n",a,b,c);elseprintf("%d
最新回复
(
0
)