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
Although we already know a great deal about influenza, and although the World Health Organization is constantly collecting detai
Although we already know a great deal about influenza, and although the World Health Organization is constantly collecting detai
admin
2009-06-24
41
问题
Although we already know a great deal about influenza, and although the World Health Organization is constantly collecting detailed information from its chain of influenza reference laboratories throughout the world, it is extremely difficult for epidemiologists, who study infectious disease, to predict when and where the next flu epidemic will occur, and how severe it will be.
There are three kinds of influenza virus, known as A, B and C. Influenza C virus is relatively stable and causes mild infections that do not spread far through the population. The A and B types are unstable, and are responsible for the epidemics that cause frequent concern. Following any virus attack, the human body builds up antibodies which confer immunity to that strain of virus, but a virus with the capacity to change its character is able to by-pass this protection. Variability is less developed in the influenza B virus, which affects only human beings. An influenza B virus may cause a widespread epidemic but will have little effect if introduced into the same community soon afterwards, since nearly everyone will have built up antibodies and will be immune. The influenza A virus, which affects animals also, is extremely unstable and is responsible for some of the worst outbreaks of the disease, such as the unparalleled pandemic, or world epidemic, of 1918-19, when about half the world’s population were infected and about twenty million people died, some from pneumonia caused by the virus itself and some from secondary complications caused by bacteria.
Accurate prediction is difficult because of the complication of the factors. A particular virus may be related to one to which some of the population have partial involved immunity. The extent to which it will spread will depend on factors such as its own strength, or virulence the ease with which it can be transmitted and the strength of the opposition it encounters. Scientists, however, have a reliable general picture of the world situation, influenza A attacks us in waves every two or three years, while influenza B, which travels more slowly, launches its main assaults every three to six years. The outbreaks vary from isolated cases to epidemic involving a tenth or more of the population. We may confidently prophesy that sooner or later large numbers of people will be feeling the unpleasant effects of some kind of influenza virus.
选项
A、Symptoms of influenza.
B、Man Versus Virus.
C、World Health Organization: Forefront against Influenza Virus.
D、Variability of Influenza Virus.
答案
B
解析
这是道主旨题,考察考生对本文的中心思想的理解。通读全篇我们可以看到虽然本文提到感冒病毒和世界卫生组织如何面对流感病毒以及流感病毒的变异等等,这篇文章的中心思想还是人类如何对抗流感病毒。这篇文章的标题应该是"人类对抗病毒"。而不是感冒的症状等其他问题。
转载请注明原文地址:https://kaotiyun.com/show/lSHd777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
"HappyBirthdaytoYou"ThemainproblemindiscussingAmericanpopularcultureisalsooneofitsmaincharacteristics:itwon’
Theunionrepresentativeputacrossherargumentveryeffectively.
OilandEconomyCouldthebadolddaysofeconomicdeclinebeabouttoreturn?SinceOPECagreedtosupply-cutsinMarch,th
Itisoutofthequestionthattheinspectorwillcometomorrow.
A.thetimely(及时的)discoveryB.convenienceC.sexequalityD.itsconnectionwithhumansE.thehugepowerF.itsuncertaintyEne
AreYoungGirlsOutofControlToday?Imagesonfashionmagazinesandtelevisionareconstantlypromotingsexintheiradver
HuntingforaJobHuntingforajoblastyear,lawyerGantRedmonstumbledacrossCareerBuilder,ajobdatabaseontheInter
Initssecondgeneration,thesmallestBMWbecomesmorefuel-efficientinitsEuropeanversion.
KeeponFightingTurningonceagaintothequestionofinvasion,Iwouldobservethattherehasneverbeenaperiodinallt
Dolphinsarenottheonlyanimals(31)humansthatusesoundsinanapparentlyintelligentmanner.Whalesalsouseacomplexsys
随机试题
用户编制程序时使用的设备与实际能占用的设备无关,这种特性称为
在社会分化作用下,在一种语言内部可以形成不同的地域方言、_______和社会方言。
下列建筑材料中,属于多孔吸声材料的有()。
可转换债券发行的担保范围应包括()。
按照阶段划分,风险处置可以划分为()。
某国有独资企业被依法宣告破产,企业破产时管理人审查的财产和债权人申报的债权情况如下:企业破产时经营管理的财产评估变现价值:(1)生产厂房价值300万元,用于对A银行240万债务的抵押;(2)借用B公司的办公楼价值160万元;(3)专有技术评估作价70
制定我国教育目的的理论基础是()。
从卫星在外太空拍摄的地球照片来看,地球是一个蓝色的星球,这是因为()。
ThefamilyisthecenterofmosttraditionalAsians’lives.Manypeopleworryabouttheirfamilies’welfare,reputation,andhon
NextmonthBritonswillhaveyetmoresmartphonestochoosefrom,whendevicesfromWiko,atwo-year-oldFrenchcompany,goons
最新回复
(
0
)