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
15
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] The passage suggests that a lack of modern sanitation would make which of the following most likely to occur?
选项
A、An outbreak of Lyme disease.
B、An outbreak of dengue hemorrhagic fever.
C、An epidemic of typhoid.
D、An epidemic of paralytic polio among infants.
E、An epidemic of paralytic polio among adolescents and adults.
答案
C
解析
作者指出,缺乏现代卫生手段会使哪件事发生?原文L8—20,现代卫生手段反而促使脊髓灰质炎造成更多瘫痪,并明确指出:能抵御伤寒流行的卫生措施反而会造成瘫痪型脊髓灰质炎流行。取非得:C.正确,伤寒流行。A、B、D、E皆不符合上述推理。
转载请注明原文地址:https://tihaiku.com/zcyy/3359177.html
相关试题推荐
Itcanbeinferredfromthepassagethatthemorphogeneticdeterminantspresent
Itcanbeinferredfromthepassagethatthemorphogeneticdeterminantspresent
Althoughmanypeoplewouldnotbelieveit,themosquitoisactuallythemostdan
Althoughgeneticmutationsinbacteriaandvirusescanleadtoepidemics,so
Althoughgeneticmutationsinbacteriaandvirusescanleadtoepidemics,so
Althoughgeneticmutationsinbacteriaandvirusescanleadtoepidemics,so
Althoughgeneticmutationsinbacteriaandvirusescanleadtoepidemics,so
Theusefulnessofliedetectorscannotbeoverestimated.Althoughthereisnoem
Althoughspinachisrichincalcium,italsocontainslargeamountsofoxalicac
54.Thebrainsofidenticaltwinsaregeneticallyidentical.Whenonlyoneofap
随机试题
Itisclearand【D6】________thatviolentcrimehasincreasedgreatlyintheU
[originaltext]Todayeveryonewillacceptmoneyinexchangeforgoodsandser
两个以上不同资质的单位实行联合共同承包的,应当按照资质等级高的单位的业务许可范围
地高辛与下列哪种药物合用会降低地高辛血浆浓度()A.新霉素 B.甲状腺素
功用为清泻肺热,止咳平喘的方剂是()A.止嗽散 B.泻白散 C.麻
甲企业的产品组合为3种洗衣粉、4种香皂、5种纸巾和6种洗发水,共18种产品。目前
位于9度抗震设防区、设计基本地震加速度值为0.40g,设计地震分组为第一组,建筑
患者生气后突然出现昏倒,不省人事,牙关紧闭,口噤不开,两手握固,肢体强痉。 2
乳牙龋病充填后疼痛的因素,可能性不大的是()A.制备洞形时机械切削、振动、压
根据具体项目的不同,每个项目过程组的活动水平和时间长度都会有所不同。在一般情况下
最新回复
(
0
)