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
外语
As West Nile virus creeps toward California, an unlikely warrior could provide the first line of defense; the chicken. The famil
As West Nile virus creeps toward California, an unlikely warrior could provide the first line of defense; the chicken. The famil
admin
2011-01-08
42
问题
As West Nile virus creeps toward California, an unlikely warrior could provide the first line of defense; the chicken. The familiar fowl make irresistible targets for mosquitoes. Unlike crows, chickens don’t get sick from West Nile. But they do produce telltale antibodies to the virus. So in test coops scattered across the state, more than 2000 " sentinel chickens" submit to frequent blood tests. When antibodies do turn up, California health officials will know that the inevitable has occurred;the West Nile epidemic will have swept the country.
Last week alone, more than 100 new human cases of West Nile were reported. The virus was detected as far west as Colorado and Wyoming, infecting 371 and killing 16 people in 20 states plus the District of Columbia. This year West Nile appeared earlier in the mosquito season—mid-June instead of August—and claimed younger victims; the average age dropped from 65 to 54. Federal health officials are still trying to figure out why, but say they may be finding more West Nile precisely because they’re on the lookout for it. As Dr. Julie Gerberding, the new director of the Centers for Disease Control (CDC) , recently told reporters, "We’re not in crisis mode. "
When West Nile hit New York City in 1999, the CDC realized it was a victim of its own success. Because health officials had conquered most mosquito-borne diseases decades ago, many states abolished their mosquito-control programs. The Feds rushed in with funds — some $ 50 million since 1999, plus $ 31 million more this year alone — to train insect researchers, set up state testinglabs and kill off the annoying insects. The CDC established a new computer monitoring system and held strategy sessions with state officials.
Some epidemiologists question the focus — and the millions — lavished on a virus that’s killed fewer than 20. "There’s an epidemic in gun violence that’s taking more lives than West Nile virus, " says Dr. William Steinmann, director of the Tulance Center for Clinical Effectiveness and Prevention. But the Feds say their efforts have kept West Nile from doing far more damage. "We’re basically building the infrastructure to deal with this over the next 50 years, " says Dr. Lyle Peterson, a CDC ep¬idemiologist. "This is here to stay. "
So far, there are no remedies for West Nile. Officials eventually expect the virus to settle into a quiet pattern of mild infections with occasional outbreaks. To do battle at home, the CDC recommends eliminating standing water and using insect spray with DEET — simple precautions, but the best defense against an invader that shows no signs of going away.
In California scientists use chicken to
选项
A、sweep away the West Nile epidemic.
B、produce antibodies to West Nile virus.
C、fight against the spread of West Nile virus.
D、monitor the presence of the West Nile virus.
答案
D
解析
该题为细节题。根据第一段第三句至第五句“Unlike crows,chickens don’t get sick from West Nile.But they do produce telltale antibodies to the virus.So in test coops scattered across the state,more than 2000‘sentinel chickens’submit to frequent blood tests.”我们知道,和乌鸦不一样,鸡不会染上西尼罗河病毒,但是鸡会产生一种抗体,这种抗体能够让人们详细了解西尼罗。河病毒,因此,全州有2000多只“哨兵鸡”在接受频繁的血液检查。因此,我们可以判断出,加利福尼亚州的科学家对鸡进行血液检查是为了检查鸡有没有产生西尼罗河病毒抗体,即检测西尼罗河病毒存在与否,故选择D项。
转载请注明原文地址:https://kaotiyun.com/show/h2xd777K
本试题收录于:
公共英语四级笔试题库公共英语(PETS)分类
0
公共英语四级笔试
公共英语(PETS)
相关试题推荐
TheU.S.SupremeCourthasforbiddenprayersinpublicschools,butmanyAmericansclingtotheideathattheireducationalsys
SoftwarepiracyproblemsexistandhavebeenexacerbatedinrecentyearsduetoISoverload,decentralizedpurchasing,budgetc
Fromyourlifeexperienceyoufindthatasenseofhumorisveryimportantindealingwiththeproblemsinyourlifeaswellas
Somecitiesgrowverylargebecauseoftwoimportantreasons.First,theremaybeimportantnaturalresourceslikewood,gas,oi
Somecitiesgrowverylargebecauseoftwoimportantreasons.First,theremaybeimportantnaturalresourceslikewood,gas,oi
Themainproblempeoplemayencountertodayarisesfromthefactthat______.
Thetangohasprobablytraveledfurtherandgonethroughmorechangesthanalmost【C1】______Africanslavesbroughtthetangot
Thetangohasprobablytraveledfurtherandgonethroughmorechangesthanalmost【C1】______Africanslavesbroughtthetangot
ThedivorcerateinAmericahasreached______.
随机试题
深Ⅱ度烧伤局部损伤的深度是
A.肩胛间区、胸骨旁、上腹部可闻及血管杂音B.大量蛋白尿C.尿中白细胞、脓细胞较多,且有尿频、尿急史D.满月脸,多毛E.发作时血压骤升伴剧烈头痛,心悸,不发作时血压可正常患者,男,35岁。肾病综合征10年,血压升高2年,临床特点
下列哪项不是右心衰竭临床表现
患者,男,26岁,受凉后突然畏寒,高热,左侧胸痛伴咳嗽,咳少量铁锈色痰,胸部X线片见左下肺大片淡薄阴影。正确选用抗生素为
具有清热化痰、宽中散结作用的药物是()
A、B、C、D公司均为增值税一般纳税人,适用的增值税税率为17%,假定销售商品、原材料的成本在确认收入时逐笔结转,商品、原材料售价中不合增值税。A公司2016年报表已于2017年1月份报出。2017年2月,A公司发生如下交易或事项:(1)1日,A公司收到
关于商用房贷款的还款方式,表述错误的是()。
某公司2013年12月份销售收入和2014年1~2月份的预计销售收入分别为200万元、180万元、250万元。其他有关资料如下:(1)收账政策:当月销售当月收现80%,其余部分下月收回。(2)材料按下月销售收入的70%采购。付款政策:当
在共同犯罪中的教唆犯()。
Readthetextbelowaboutthesalaryoffernegotiation.Inmostofthelines(34-45),thereisoneextraword.Itiseithergram
最新回复
(
0
)