首页
登录
职称英语
Since 1975 there has been in the United States a dramatic decline in the inciden
Since 1975 there has been in the United States a dramatic decline in the inciden
游客
2024-01-13
38
管理
问题
Since 1975 there has been in the United States a dramatic decline in the incidence of traditional childhood diseases such as measles. This decline has been accompanied by an increased incidence of Peterson’s disease, a hitherto rare viral infection, among children. Few adults, however, have been affected by the disease. Which of the following, if true, would best help to explain the increased incidence of Peterson s disease among children?
选项
A、Hereditary factors determine in part the degree to which a person is susceptible to the virus that causes Peterson’ s disease.
B、The decrease in traditional childhood diseases and the accompanying increase in Peterson’s disease have not been found in any other country.
C、Children who contract measles develop an immunity to the virus that causes Peterson s disease.
D、Persons who did not contract measles in childhood might contract measles in adulthood, in which case the consequences of the disease would generally be more severe.
E、Those who have contracted Peterson’s disease are at increased risk of contracting chicken pox.
答案
C
解析
正确答案应能解释麻疹发病率的下降和Peterson病发病率的上升。(C)指出得过麻疹的儿童形成了Peterson的免疫力,既然麻疹发病率少了,那么更少的儿童有对Peterson的免疫力,因此,随着前者的下降而后者上升,所以(C)正确;(A)指出遗传因素的作用,但并不能解释为什么Peterson发病率上升;(B)中的“其他任何国家”,与“美国”无关;(D)、(E)均不能起到解释作用.
转载请注明原文地址:https://tihaiku.com/zcyy/3358465.html
相关试题推荐
CarsareanimportantpartoflifeintheUnitedStates.Withoutacar,most
CarsareanimportantpartoflifeintheUnitedStates.Withoutacar,most
CarsareanimportantpartoflifeintheUnitedStates.Withoutacar,most
CarsareanimportantpartoflifeintheUnitedStates.Withoutacar,most
CarsareanimportantpartoflifeintheUnitedStates.Withoutacar,most
CarsareanimportantpartoflifeintheUnitedStates.Withoutacar,most
CarsareanimportantpartoflifeintheUnitedStates.Withoutacar,most
CarsareanimportantpartoflifeintheUnitedStates.Withoutacar,most
CarsareanimportantpartoflifeintheUnitedStates.Withoutacar,most
CarsareanimportantpartoflifeintheUnitedStates.Withoutacar,most
随机试题
[originaltext]InAmericatoday,lotsofpeoplearegettingtattoos—especial
Whichofthefollowingitalicizedpartsisasubjectclause(主语从句)?A、Wearequite
MarcoPolowasborninItalyin1254.Hewasthemost【71】f______westernerto
“图像>陷印”菜单命令对下列哪种模式的图像起作用?
半刚性基层材料包括级配碎石、水泥稳定土、石灰稳定土、石灰稳定工业废渣和综合稳定土
翼片对下列检查较适宜的是A.观察多发性早期邻面龋 B.观察咬合创伤的程度 C
一般而言,信贷前台部门负责客户营销和维护,也是银行的“利润中心”。( )
带串补装置的线路停、送电操作顺序正确的是?停电时先停串补、后停线路$;$送时先送
如图,两个同心圆构成的圆环被均匀地分割成7份,连同中间的小圆共8个区域。若要给这
期货公司取得金融期货结算业务资格之日起6个月内,未取得期货交易所结算会员资格的,
最新回复
(
0
)