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] It can be inferred from the passage that Lyme disease has become prevalent in parts of the United States because of which of the following?
选项
A、The inadvertent introduction of Lyme disease bacteria to the United States.
B、The inability of modern sanitation methods to eradicate Lyme disease bacteria.
C、A genetic mutation in Lyme disease bacteria that makes them more virulent.
D、The spread of Lyme disease bacteria from infected humans to noninfected humans.
E、An increase in the number of humans who encounter deer ticks.
答案
E
解析
文中指出,为什么莱姆病在美国部分地区流行?此点在原文有明确回答。L26—30。∴E正确,接触鹿蜱的人数增多。A、B、C、D都明显和原文此处叙述不一致。
转载请注明原文地址:https://tihaiku.com/zcyy/3359179.html
相关试题推荐
Itcanbeinferredfromthepassagethatthemorphogeneticdeterminantspresent
Itcanbeinferredfromthepassagethatthemorphogeneticdeterminantspresent
Itcanbeinferredfromthepassagethatthemorphogeneticdeterminantspresent
Itcanbeinferredfromthepassagethatthemorphogeneticdeterminantspresent
Althoughmanypeoplewouldnotbelieveit,themosquitoisactuallythemostdan
Althoughgeneticmutationsinbacteriaandvirusescanleadtoepidemics,so
Althoughgeneticmutationsinbacteriaandvirusescanleadtoepidemics,so
Althoughitisassumedthatpeacocks’magnificenttailsfunctionessentiallyto
Althoughspinachisrichincalcium,italsocontainslargeamountsofoxalicac
Althoughcompactcarsmakeuponly38percentofthevehiclesintraffic,48per
随机试题
Peoplehavebeenfondofrosessincethebeginningoftime.Infact,itiss
Itisimpossibletofindoutexactlyhowmanyvolunteersareatworktodayi
Scatteredaroundtheglobearemorethan100smallregionsofisolatedvolca
Text3Economistsacrossthepoliticals
下列关于注册测绘师执业活动的说法中,正确的是()。A.在测绘活动中形成的技术设计
阻断M受体的药物是A.美卡拉明 B.琥珀胆碱 C.哌仑西平 D.酚妥拉明
高低点分析法可以用于( )。 A.运输总支出预测 B.成本费用核算
设随机向量(X,Y)的联合分布律为 则a的值等于( )。A.1/3 B
某男,65岁,阴虚火旺,症见潮热盗汗咳嗽咯血、耳鸣遗精。宣选用的成药是()
国务院令第724号《保障农民工工资支付条例》,自2020年5月10起施行。为了规
最新回复
(
0
)