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
59
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
HenryPaulson,TreasurySecretary,leftShanghaiyesterday,wherehemadeanendofthevisittothethreecountriesinAsia.Ast
Overthepastfewyears,outcriesfromfoodactivistshavechangedmanyAmericans’eatinghabits-.Criticismofwidespreadpestic
Ahundredyearsagoitwasassumedandscientifically"proved"byeconomiststhatthelawsofsocietymakeitnecessarytohave
Inadditiontoredistributingincomes,inflationmayaffectthetotalrealincomeandproductionofthecommunity.Anincreasein
He____thejobbecauseitinvolvedtoomuchtraveling.
MargheritaisaLondongirlandarrivingatCapitalwaslikecominghome."IgrewuplisteningtoCapitalRadio,"shesays."Peo
Themulti-billion-dollarWesternpopmusicindustryisunderfire.ItisbeingblamedbytheUnitedNationsforthedramaticris
Themulti-billion-dollarWesternpopmusicindustryisunderfire.ItisbeingblamedbytheUnitedNationsforthedramaticris
Thereareanumberofformatsforreportingresearch,suchasarticlestoappearinjournals,reportsaddressedtofundingagenc
Hippiesweremembersofayouthmovementofthe1960’sand1970’sthatstartedintheUnitedStatesandspreadtoCanada,Great
随机试题
采用滴定法测定肉制品的过氧化值时,公式中过氧化值计算的换算因子为()。
______hardandyouwillsucceed!
诊断肾病综合征必须具备的依据是
患者男,19岁,学生。某日去邮局领取汇款300元,柜台上放着3张100元,一目了然,患者接过后便放进衣袋。一出邮局,觉此举过于疏忽,唯恐刚才数错了,便将钱拿出反复再数。又一转念,是否衣袋里原来就有1张100元的钞票呢?明知自己并没有弄错,但仍无法控制,为此
下列哪项不属于分散片的特点
某沥青软化点实测结果为55.4℃,试验结果应记作()。
下列项目中,不缴纳消费税的有( )。
股票是一种有价证券,它是股份有限公司和有限责任公司签发的证明股东所持有股份的凭证。()
甲公司2016年销售收入1000万元,变动成本率60%,固定成本200万元,利息费用40万元。假设不存在资本化利息且不考虑其他因素,该企业联合杠杆系数是()。
分数的合成方法包括()
最新回复
(
0
)