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
In the 21st century there’s no doubt that frightening new infectious diseases will appear. Today new viruses are coming out of n
In the 21st century there’s no doubt that frightening new infectious diseases will appear. Today new viruses are coming out of n
admin
2019-01-25
71
问题
In the 21st century there’s no doubt that frightening new infectious diseases will appear. Today new viruses are coming out of nature and "discovering" the human species. Just since 1994, at least 30 new viruses have appeared.
Viruses are moving into the human species because there are more of us all the time. From a virus’ point of view, we look like a free lunch that’s getting bigger.
In nature
viral diseases tend to break out when populations increase rapidly and become densely packed. Then many deaths occur and the population drops. This is nature’s population-control mechanism. There is no reason to think the human race is free from the laws of nature.
Giving these laws an extra push will be the rise of megacities—huge densely packed cities in less developed nations. A United Nations study predicts that by the year 2015, there will be 26 extremely big cities on the planet. By then, some megacities could have 30 million or more people. That is approximately the total population of California. Imagine all the people in California crowded together tightly into one vast city. Then remove most doctors and medical care, take away basic sanitation and hygiene, and you have a biological " time bomb". Now make eight or ten such "bombs" and plant them around the world.
Also consider the biological weapons the world will be capable of producing in the future. The 20th century saw the creation of great and terrible weapons based on the principles of nuclear physics. The 21st century will see great and terrible weapons based on the knowledge of DNA and the genetic code. As biotechnology becomes more sophisticated and powerful, biologists will learn how to mix genes of different microbes to create unnatural strains that can be turned into deadly, effective weapons.
Biological weapons are a disgrace to biology. Most biologists haven’t wanted to talk or even think about them. The physicists lost their innocence when the first nuclear bomb went off in 1945. The biologists will lose their innocence when the first biological weapon spreads through the human species.
Yet the 20th century survived despite the existence of the nuclear bomb. There was great economic and scientific progress and much human happiness. The same can be true in the next century. We may not completely win the 21st century microbe war, but I am confident that we won’t lose it.
What does the text mainly discuss?
选项
A、Threats from the new microbes in the next century.
B、How new viruses affect the human society.
C、What megacities may bring to human species.
D、The disastrous effect of nuclear and biological weapons.
答案
A
解析
该题为主旨题。全文主要论述二十一世纪我们会遇到细菌入侵的问题。第一段阐述21世纪会有新型病毒出现;第二段阐述病毒侵袭人类的原因;第三段阐述为什么大城市是新型病毒青睐的对象;第四、五段阐述生化武器会在未来出现;最后一段作者展望未来,并且相信人类会战胜生化武器。选项A“下个世纪有来自新型细菌的威胁”符合文意。选项B“新型细菌怎样影响人类社会”和选项C“大城市会给人类带来什么”在文中没有提到;选项D“核武器和生化武器的灾难性影响”在文中倒数第二、三段提到过,但这只是文章内容的一部分并不能作为全文的主旨,故选A。
转载请注明原文地址:https://kaotiyun.com/show/RoCd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
Ifsustainablecompetitiveadvantagedependsonworkforceskills,Americanfirmshaveaproblem.Humanresourcemanagementisn
Ifsustainablecompetitiveadvantagedependsonworkforceskills,Americanfirmshaveaproblem.Humanresourcemanagementisn
Directions:Studythefollowingtablecarefullyandyourcompositionmustbebasedontheinformationgiveninthetable.Yous
Broadlyspeaking,theEnglishmanisaquiet,shy,reservedpersonwhoisfully【21】______onlyamongpeopleheknowswell.In
Asweenterthe21stcentury,anewglobaleconomydrawsnationsevercloser.Butourgrowinginterdependence【21】______onm
Asweenterthe21stcentury,anewglobaleconomydrawsnationsevercloser.Butourgrowinginterdependence【21】______onm
Asweenterthe21stcentury,anewglobaleconomydrawsnationsevercloser.Butourgrowinginterdependence【21】______onm
Asweenterthe21stcentury,anewglobaleconomydrawsnationsevercloser.Butourgrowinginterdependence【21】______onm
Asweenterthe21stcentury,anewglobaleconomydrawsnationsevercloser.Butourgrowinginterdependence【21】______onm
随机试题
()是研究如何利用计算机模仿人的智能,并是在计算机与控制论科学上发展起来的边缘学科。
A.蹄裂B.白线裂C.蹄叶炎D.蹄叉腐烂E.蹄冠蜂窝织炎马,5岁,精神沉郁,体温40℃,不愿站立和运动,驻立时,双前肢前伸,双后肢伸至腹下,以蹄踵着地。叩诊蹄壁敏感。根据临床表现诊断所患蹄病是
下列关于证券公司向期货公司提供中间介绍服务的说法中,正确的是()。
痛风症应控制的食物是()。
2017年2月,119指挥中心接到报警,某区一市场发生火灾,指挥中心立即调派6个中队33部消防车到场处置。消防官兵正在奋力扑救火灾,市场外聚集了很多围观群众,造成交通堵塞。对此次突发事件现场处置不恰当的是()。
【背景材料及试题】关于领导干部需要具备哪些素质,下面给出了10项,请你从下属的10个选项中选出5项并按重要性进行排序。1.走群众路线.2.实事求是。3.辩证思维。4.全局观。5.长远的发展目光。
强化仪式:指组织公开承认或奖励员工贡献的一种礼仪活动,具有激励、强化员工对组织的承诺,使员工与组织牢固地联系在一起的作用。下列属于强化仪式的是()。
无领导小组讨论(有题本,阅读时间20分钟,可带入考场;讨论时间共70分钟)材料:大致内容是从现在早餐供应和需求状况来看,早餐(如油条等)存在卫生方面的问题,市民都希望能够吃到放心油条,政府对此做出了具体规定,提高了设立早餐摊点的门槛,并积极扶持部
在编写事务时,各事务尽量按照相同的顺序来访问资源,这样做的好处是()。
CanadianauthoritiesrelayedthatsuspiciontotheU.S.CoastGuard,whichdispatchedacuttertointerceptthevessel.Aftera
最新回复
(
0
)