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
Historically, the spread, prevalence, and very existence of contagious disease have wholly depended on the growth and concentrat
Historically, the spread, prevalence, and very existence of contagious disease have wholly depended on the growth and concentrat
admin
2017-06-11
58
问题
Historically, the spread, prevalence, and very existence of contagious disease have wholly depended on the growth and concentration of human populations.【R1】______And though the last century has witnessed substantial worldwide success in combating many past scourges—such as polio and smallpox—infectious diseases still claim more lives than any other group of diseases. The prevailing demographic trends continue to create a crowded human " medium" that both invites and is vulnerable to infection.
The share of humanity living in cities with more than 1 million people has surged from less than 5 percent in 1900 to nearly 40 percent today, creating the ideal setting for the resurgence of old infectious diseases as well as the development of new ones.【R2】______
Overcrowding—the increased proximity of susceptible individuals—is a principal risk factor for the incidence and spread of all major infectious diseases, including tuberculosis, dengue fever, malaria, and acute respiratory illnesses, which are unable to spread and survive in low population densities.【R3】______
Aside from sheer growth and increasing density, the urbanization under way in developing nations is often accompanied by deteriorating health indicators and increased exposure to disease risk factors.
Access to clean water, good hygiene, and adequate housing are sorely lacking in developing nations. As a result, waterborne infections such as cholera and other diarrheal diseases account for 90 percent of all infectious diseases in developing countries—and 40 percent of all deaths in some nations.【R4】______
In both industrial and developing nations, incidences of a wide range of infectious diseases, including tuberculosis, diarrheal diseases, and HIV/AIDS, are considerably higher in urban slums— where poverty and compromised health define the way of life—than in the rest of the city.【R5】______
A. Key disease carriers, such as insects and rats, thrive in crowded urban settings, further facilitating spread.
B. The unprecedented population densities in fourteenth-century Europe, for example, led to the plague outbreak that claimed the lives of one fourth of the population.
C. Although these infections are easily preventable if adequate water and sanitation are available, the vast majority of the world’s population is lifelong victims.
D. While new global markets have created unprecedented economic opportunities and growth, the health risks of our increasingly interconnected and fast-paced world continue to grow.
E. Pathogens can more readily establish in large populations, since all infectious diseases require a critical number of vulnerable individuals in order to take root and spread.
F. These areas can serve as a perpetual reservoir of disease or disease vectors, placing other parts of the city at risk of an outbreak and allowing the disease to continue evolving, often into a deadlier strain.
【R5】
选项
答案
F
解析
文章的最后一段主要讲述各种疾病暴发的源地,选项F与此意相近,是正确答案。
转载请注明原文地址:https://kaotiyun.com/show/K5FO777K
0
考博英语
相关试题推荐
InTheBirthOrderBook:WhyYouAretheWayYouAre(2004),Dr.KevinLemannotesthat21ofthefirst23Americansinspacewer
I_____havewrittentohimbecausehephonedmeshortlyafterwards.
Brushingremoveslargerparticles,butdentistssuggestbrushingthebackofthetongueaswell,wherefoodresiduesandbacteri
Readthefollowingpassagecarefullyandthenparaphrasethenumberedandunderlinedparts.("Paraphrase"means"toexplainthem
Thepoliceaccusedhimofsettingfiretothebuildingbuthedenied_____intheareaonthenightofthefire.
Ingeneral,theamountthatastudentspendsforhousingshouldbeheldtoone-fifthofthetotalforlivingexpenses.
Ayearagothefirmhada_____lossof4.3milliondollarsor20centsashareafterallnecessarydeduction.
Heatexhaustionisaconditioncausedby____tosunlightoranotherheatsourcewhichoftenresultsindehydrationandsaltdeple
Althoughwedecoratedtheroomonlysixmonthsago,thepaintontheceilingisalready_____becauseofthedamp.
ThecollapseoftheEarth’smagneticfield-whichguardstheplanetandguidesmanyofitscreatures-appearstohavestartedabou
随机试题
土地抵押权变更登记,下列()情形的申请人包括抵押人、抵押权人和受让人。
如图4-60所示均质圆盘放在光滑水平面上受力F作用,则质心C的运动为()。
砂砾石地基的特点包括()。
下列选项中,属于当事人提起诉讼必须符合的条件的有()。
人工智能听起来很遥远,其实已经______到我们的日常工作和生活中了。人工智能的应用,让生活更便捷、更有乐趣,节约时间、解放体力,甚至未来机器将______人类进行一些基础性的劳作,这个场景令人憧憬。
快递包装标准滞后、回收循环难度大、环保意识不足,是阻碍快递包装绿色化的三大瓶颈。要打破这些瓶颈,还有大量的工作要做。比如,必须解决现行标准多为推荐性指标、约束力不强、执行有难度等问题,出台国家级的强制性标准;要解决对快递件的“五花大绑”、过度包装问题,首先
阅读下述材料,谈谈你对班主任做法的认识。一位家长在星期一发现儿子上学时磨磨蹭蹭,遂追问是怎么回事,孩子犹豫了半天才道出实情。原来在上个星期二早上,班主任老师召开全班同学会议,用无记名的方式评选3名“坏学生”,因有两名同学在最近违反了学校纪律,无可
A、 B、 C、 D、 B
ALACRITY:
A、Becausewemightbeofferedadishofinsects.B、Becausenothingbutfreshlycookedinsectsareserved.C、Becausesomeyuppies
最新回复
(
0
)