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
医学
Although genetic mutations in bacteria and viruses can lead to epidemics, some epidemics are caused by bacteria and viruses that
Although genetic mutations in bacteria and viruses can lead to epidemics, some epidemics are caused by bacteria and viruses that
admin
2018-05-06
24
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 significant 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, infection had occurred during infancy, when it typically provided lifelong immunity without paralysis. Thus, the hygiene that helped prevent typhoid epidemics indirectly fostered a paralytic polio 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 become 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 activities in the deer’s habitat. Similarly, an outbreak of dengue hemorrhagic fever became an epidemic in Asia in the 1950s because of ecological changes that caused Aedesaegypti, 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, Aedesalbopictus.
According to the passage, the outbreak of dengue hemorrhagic fever in the 1950s occurred for the reason that______.
选项
A、the mosquito Aedesaegypti was newly introduced into Asia
B、the mosquito Aedesaegypti became more numerous
C、the mosquito Aedesalbopictus became infected with the dengue virus
D、more people began to visit and inhabit areas in which mosquitoes live and breed
答案
B
解析
细节题。题目问的是根据文章内容,20世纪50年代登革出血热发生的原因是______。根据“dengue hemorrhagic fever in the 1950s”定位到文中倒数第二句“…because of ecological changes that caused Aedesaegypti,the mosquito that transmits the dengue virus,to proliferate”可知由蚊子的繁殖传播了登革热病毒。故选B。
转载请注明原文地址:https://kaotiyun.com/show/deT3777K
本试题收录于:
医学博士外语题库考研分类
0
医学博士外语
考研
相关试题推荐
Justbeforedawnwereceivedacallthatanunresponsiveinfantwasbeingbroughtbyemergencymedicalservicestoourhospital.
Ihadneverbeeninthepublicwardofahospitalbefore,anditwasmyfirstexperienceofdoctorswhohandleyouwithoutspeak
Confrontedwithpatientfacingdeath,physiciansmayfeelasenseofmedicalimpotenceandfailure.Yearsoftrainingandzealt
Confrontedwithpatientfacingdeath,physiciansmayfeelasenseofmedicalimpotenceandfailure.Yearsoftrainingandzealt
A、Thecoldweather.B、Tirednesscausedbytraveling.C、Thestrangefoodhehadeaten.D、Thegreasyfoodhehadeaten.D女士指出男士有这些
Hisweakchest______himtowinterillness.
A、Currentsmokersexclusively.B、Second-handsmokers.C、Withalungproblem.D、Atage40orover.D根据文中whowerehealthy,atleast
A、Thrilled.B、Refreshed.C、Exhausted.D、Depressed.C根据文中we’veactedforhours,Let’sgetsomethingtoeat,We’dbeabletofeelbe
DearDr.Benjamin,CongratulationsonyournominationasUnitedStatesSurgeonGeneral.Basedonyourextraordinarycareera
A、TogotoSusanforadvice.B、TotrytothinklikeSusan.C、TobreakupwithSusan.D、TohaveadatewithSusan.A录音中女士建议:“Susa
随机试题
Peopleareusedtospeakingtheirnativelanguage,soimmigrantsarehavingmanyproblemsbetweenthefirstgenerationandthes
小气道通气功能减低与下列哪种疾病有关
患者男性,64岁。因呕血、黑便2小时入院。既往有慢性乙型肝炎10余年。入院查.ALT124U/L,AST153U/L,总胆红素91μmol/L,血清白蛋白16g/L,凝血酶原时间21s,CO2﹣CP15mol/L,BUN20.5mmol/L,Cr25
大肠的传导变化作用是何种功能的延伸
下列关于计算机病毒说法不正确的是()。
中国证监会自受理申请文件到做出决定的期限为3个月,发行人根据要求补充、修改发行申请文件的时间也计算在内。( )
企业以《资源综合利用企业所得税优惠目录》规定的资源作为主要原材料,生产非国家限制和禁止并符合国家和行业相关标准的产品取得的收入()。
《灭亡》通过一个无政府主义者()的形象,真实地描述了自己参加社会运动以来的心路历程。
尚未制定法律、行政法规,且属于地方性事务的,地方性法规可以设定扣押财物的行政强制措施。()
设某大型商场有各种商铺销售大量的产品,对该商场数据库应用系统,在其生命周期中,设有下列活动:Ⅰ.开发人员启动执行DDL代码建立数据库结构Ⅱ.编写商品信息录入和导入程序,在开业前建立商品信息清单Ⅲ.根据商场销售业务开展情况,调整数据库中的商品清单和价格
最新回复
(
0
)