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
Shortages of flu vaccine are nothing new in America, but this year’s is a whopper. Until last week, it appeared that 100 million
Shortages of flu vaccine are nothing new in America, but this year’s is a whopper. Until last week, it appeared that 100 million
admin
2014-09-28
59
问题
Shortages of flu vaccine are nothing new in America, but this year’s is a whopper. Until last week, it appeared that 100 million Americans would have access to flu shots this fall. Then British authorities, concerned about quality-control problems at a production plant in Liverpool, barred all further shipments by the Chiron Corp. Overnight, the U. S. vaccine supply dwindled by nearly half and federal health officials found themselves making an unusual plea. Instead of beseeching us all to get vaccinated, they’ re now urging most healthy people between the ages of 2 and 64 not to. "This reemphasizes the fragility of our vaccine supply, " says Dr. Martin Myers of the National Network for Immunization Information, " and the lack of redundancy in our system. "
Why is such a basic health service so easily knocked out? Mainly because private companies have had little incentive to pursue it. To create a single dose of flu vaccine, a manufacturer has to grow live virus in a 2-week-old fertilized chicken egg, then crack the egg, harvest the virus and extract the proteins used to provoke an immune re-sponse. Profit margins are narrow, demand is fickle and, because each year’ s flu virus is different, any leftover vaccine goes to waste. As a result, the United States now has only two major suppliers(Chiron and Aventis Pasteur)—and when one of them runs into trouble, there isn’t much the other can do about it. "A vaccine maker can’t just call up and order 40 million more fertilized eggs, " says Manon Cox, of Connecticut-based Protein Sciences Corp. " There’ s a whole industry that’ s scheduled to produce a certain number of eggs at a certain time. "
Sleeker technologies are now in the works, and experts are hoping that this year’ s fiasco will speed the pace of innovation. The main challenge is to shift production from eggs into cell cultures—a medium already used to make most other vaccines. Flu vaccines are harder than most to produce this way, but several biotech companies are now pursuing this strategy, and one culture-based product(Solvay Pharmaceuticals’ Invivac)has been cleared for marketing in Europe.
For Americans, the immediate challenge is to make the most of a limited supply. The government estimates that 95 million people still qualify for shots under the voluntary restrictions announced last week. That’ s nearly twice the number of doses that clinics will have on hand, but only 60 million Americans seek out shots in a normal year. In fact, many experts are hoping the shortage will serve as an awareness campaign—encouraging the people who really need a flu shot to get one.
According to the passage, which of the following is TRUE?
选项
A、All Americans are persuaded not to get vaccinated this year.
B、The big problem in innovating flu vaccine producing technique is how to grow virus in a new way.
C、More flu vaccines can not be produced in a short time because private companies refuse to produce more.
D、Flu vaccines are easier than most vaccines to produce through cell cultures.
答案
B
解析
由第一段的“Instead of beseeching us all to get vaccinated,they’re now urging most healthy people between the ages of 2 and 64, not to.”可以判断出美国之呼吁2至64岁的健康人不接种流感疫苗,而不是所有的美国人,因此答案A是错误的。从第二段最后一句话可以看出疫苗生产厂家无法临时增加疫苗生产不是由于他们不愿意,而是由于受精鸡蛋的生产已经预先计划好,无法提供更多的受精鸡蛋,由此可见答案C是错误的。从第三段第三行“Flu vaccines are harder than most to produce this way”可以判断出答案D是错误的,因为流感疫苗比别的疫苗更难用细菌培育的方式生产。而由第三段第2-3行“The main challenge is to shift production from eggs into cell cultures——a medium already used to make most other vaccines.”以及上一句可见,改造疫苗生产工艺的关键在于革新病毒培育技术。因此正确答案为B。
转载请注明原文地址:https://kaotiyun.com/show/siXd777K
本试题收录于:
公共英语五级笔试题库公共英语(PETS)分类
0
公共英语五级笔试
公共英语(PETS)
相关试题推荐
ZhangHongisplanningtogototheUnitedStatesinthespringsemester.
Foraslongasmostpeoplecanremember,foodhasbeengettingcheaperandfarminghasbeenindecline.In1974—2005foodprices
Chocolateisnotagreatsourceofnutrients,butthere’snoharmineatingamoderateamount,especiallythedarkvariety,(31)
Fromhervantagepointshewatchedthemaindoomswingopenandthefirstarrivalspourin.Thosewhohadbeenattheheadofth
Psychologiststakecontrastiveviewsofhowexternalrewards,from(31)praisetocoldcash,affectmotivationandcreativity.
Mr.GallanthasmetMr.Brownbefore.
Mr.GallanthasmetMr.Brownbefore.
Howmanylanguagesareusedthroughouttheworldtoday?
WhenschoolofficialsinKalkaska,Michigan,closedclasseslastweek,themediaflockedtothestory,portrayingthetown’s2,
Thetrampwaslockedinthestore______
随机试题
科学管理理论最早产生于()
IfPeterhadhadenoughmoney,______onthetriptoParis.
某镇有10000户,拟抽取1000户。首先将所有10000户分为1000组,每组10户。以随机数字方法确定第一组被抽到的户号为6,以后则每隔10户抽取一户,组成的样本为6,16,26,36……等序号的居民户。这种抽样方法是()。
左上12右上12缺失.缺隙一侧的余留牙基本无可利用倒凹.设计就位道时应采用
下列醇类物质在脱水剂存在下能发生分子内消去反应的是()。
发生工程质量问题,在施工单位收到《监理通知》后,在( )的组织参与下,尽快进行质量问题调查并完成报告编写。
今年的会议数量比以往明显减少,会议的内容更加______,这样,不仅可以让广大干部从文山会海中______出来,腾出更多的时间干事创业,还可以节约成本,带动工作作风的转变。填入画横线部分最恰当的一项是:
方针,是指国家在一定历史阶段为实现.定目标和完成一定任务而确定的工作指导原则。( )
学习者在第二语言习得过程中构建的,既不同于母语又不同于目的语的语言系统叫____________。(暨南大学2017)
某棵树中共有25个节点,且只有度为3的节点和叶子节点,其中叶子节点有7个,则该树中度为3的节点数为()
最新回复
(
0
)