首页
登录
职称英语
Although genetic mutations in bacteria and viruses can lead to epidemics, so
Although genetic mutations in bacteria and viruses can lead to epidemics, so
游客
2024-01-13
76
管理
问题
Although genetic mutations in bacteria and viruses can lead to epidemics, some epidemics are caused by bacteria and viruses that have undergone no sig- nificant genetic change. In analyzing the latter, scientists have discovered the importance of social and ecological factors to epidemics. Poliomyelitis, for example, emerged as an epidemic in the United States in the twentieth century; by then, modern sanitation was able to delay exposure to polio until adolescence or adulthood, at which time polio infection produced paralysis. Previously, in- fection had occurred during infancy, when it typically provided lifelong immunity without paralysis. Thus, the hygiene that helped prevent typhoid epidemics indirectly fostered a paralytic po- lio epidemic. Another example is Lyme disease, which is caused by bacteria that are transmitted by deer ticks. It occurred only sporadically during the late nineteenth century but has recently be- come prevalent in parts of the United States, largely due to an increase in the deer population that occurred simultaneously with the growth of the suburbs and increased outdoor recreational activ- ities in the deer’s habitat. Similarly, an outbreak of dengue hemorrhagic fever became an epidemic in Asia in the 1950’s because of ecological changes that caused Aedes aegypti, the mosquito that transmits the dengue virus, to proliferate. The stage is now set in the United States for a dengue epidemic because of the inadvertent introduction and wide dissemination of another mosquito, Aedes albopictus. [br] Which of the following best describes the organization of the passage?
选项
A、A paradox is stated, discussed and left unresolved.
B、Two opposing explanations are presented, argued, and reconciled.
C、A theory is proposed and is then followed by descriptions of three experiments that support the theory.
D、A generalization is stated and is then followed by three instances that support the generalization.
E、An argument is described and is then followed by three counterexamples that refute the argument.
答案
D
解析
原文主要内容:A.paradox没提到。B.两种相对解释。无。C.本文是三次疾病流行实例,不是three experiments。D.正确。提出一总结,继而为支持这总结而给出三个例子。符合原文。E.本文三个例证和一开始观点不是对立关系。
转载请注明原文地址:https://www.tihaiku.com/zcyy/3359181.html
相关试题推荐
Itcanbeinferredfromthepassagethatthemorphogeneticdeterminantspresent
Itcanbeinferredfromthepassagethatthemorphogeneticdeterminantspresent
Itcanbeinferredfromthepassagethatthemorphogeneticdeterminantspresent
Althoughgeneticmutationsinbacteriaandvirusescanleadtoepidemics,so
Althoughgeneticmutationsinbacteriaandvirusescanleadtoepidemics,so
Althoughgeneticmutationsinbacteriaandvirusescanleadtoepidemics,so
Theusefulnessofliedetectorscannotbeoverestimated.Althoughthereisnoem
Untilrecentlyexpertsbelievedthatenvironment,notgenetics,largelydetermin
Althoughcompactcarsmakeuponly38percentofthevehiclesintraffic,48per
54.Thebrainsofidenticaltwinsaregeneticallyidentical.Whenonlyoneofap
随机试题
Thechemicalfacts______asaby-productoftheirsearchforgoldbecametheba
I’mashamed______suchathing.A、thatyouwouldhavedoneB、thatyoushouldhav
AvraLeodasofSantaFe,N.M.,makesobjectsinclay--weighty,solid,myst
我自己是不会去电影院的,除非这是一部我真正想看的影片。(unless)Iwon’tgotothecinemaonmyownunlessit
Amajorsociologicaltheoryknownassymbolicinteractionismofferssomeimp
从力学角度看,弗劳德数所表示的两种力的对比关系是()。A.惯性力与粘滞力
胸腔积液患者胸水比重1.017,蛋白定量25g/L,LDH120IU/L,细胞数
为坚持房住不炒的基本原则,我国多地提高了二套房贷款的首付比率,此措施属于哪种货币
对潜蚀的处理可以采用以下()办法。A.堵截地表水流入土层 B.阻止地下水在土
(2014年真题)与一般工业产品的生产相比较,建设工程竣工质量控制的特点有()
最新回复
(
0
)