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
2022-05-19
54
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
全文主要论述二十一世纪我们会遇到细菌入侵的问题。文章第一段阐述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。由此可知A项“下个世纪有来自新型细菌的威胁”符合文意。
转载请注明原文地址:https://kaotiyun.com/show/gxCd777K
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
Oneimportantaspectofretirementformostpeopleisdecidingwheretolive.Inthepast,thiswasnotanissuebecausemostel
Oneimportantaspectofretirementformostpeopleisdecidingwheretolive.Inthepast,thiswasnotanissuebecausemostel
WhatdoesthepassagetellusaboutAmericanrivers?
WhenwethinkofHollywood—atermIuselooselytodescribeAmericanmovieproductioningeneral,notsimplyfilmsmadeinLosA
Broadlyspeaking,theEnglishmanisaquiet,shy,reservedpersonwhoisfully【21】______onlyamongpeopleheknowswell.
Broadlyspeaking,theEnglishmanisaquiet,shy,reservedpersonwhoisfully【21】______onlyamongpeopleheknowswell.
Societywasfascinatedbyscienceandthingsscientificinthenineteenthcentury.Greatbreakthroughsinengineering,theuseo
AsapoorkidgrowingupinaLosAngelesghetto,Ihaddreamsofgoingtocollegeandbecomingateacher—aseeminglyimpossible
Inthelateyearsofthenineteenthcentury,"capital"and"labour"wereenlargingandperfectingtheirrivalorganisationsonm
Ingeneral,oursocietyisbecomingoneofgiantenterprisesdirectedbyabureaucraticmanagementinwhichmanbecomesasmall,
随机试题
A.糖浆B.硬脂酸镁C.乙烯一醋酸乙烯共聚物D.卡波姆E.羧甲基淀粉钠作为助悬剂的是
在对建筑外墙装饰材料进行的防火检查中,下列不符合相关规范要求的是()。
下列关于下岗失业人员小额担保贷款的说法,正确的是()。
某社会团体与某私立学校共同出资依法设立一合伙企业,经营文具用品。两年后,因经营亏损,该合伙企业财产不足以清偿全部债务。下列关于各合伙人承担责任的表述中,符合《合伙企业法》规定的有()。
wifi:网线
党的十七大报告指出,深入贯彻落实科学发展观,必须坚持
下列关于路由器技术指标的描述中,错误的是
考生文件夹下存在一个数据库文件“samp3.accdb”,里面已经设计好表对象“tStud”和“tScore”,同时还设计出窗体对象“fStud”和子窗体对象“fScore子窗体”。请在此基础上按照以下要求补充“fStud”窗体和“fScore子窗体”子窗
一个女孩走过一片草地,看见一只蝴蝶被刺弄伤了。她小心地为它【C1】______掉刺,让它飞向大自然。后来蝴蝶为了报恩,变成了一位仙女。仙女对小女孩说:“因为你很【C2】______,请你许个愿,我可以帮助你实现愿望。”小女孩想了想说:“我想要快乐。”于是仙
Theworld’senvironmentissurprisinglyhealthy.Discuss.Iftherewereanexaminationtopic,moststudentswouldtearitapart
最新回复
(
0
)