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
Among the devastating consequences of AIDS has 【21】______ its epidemic spread in the developing world. The disease has cause
Among the devastating consequences of AIDS has 【21】______ its epidemic spread in the developing world. The disease has cause
admin
2010-07-06
26
问题
Among the devastating consequences of AIDS has 【21】______ its epidemic spread in the developing world. The disease has caused 【22】______ suffering, debilitation, loss of life and disruption of family, social and economic 【23】______ Because of the considerable expense and logistical difficulty in providing antiviral drugs to populations 【24】______ with the Human Immunodeficiency Virus 【25】______ the world, the biomedical community is looking towards vaccines to help solve this compelling problem.
The search for an AIDS vaccine began more than 15 years ago with great 【26】______ and high expectations. With the 【27】______ of the Human Immunodeficiency Virus (HIV) as the cause of AIDS, it seemed that a 【28】______ would follow closely behind. But despite a large concerted effort, the problem has proven more difficult than 【29】______ , and progress has not 【30】______ the 【31】______ hopes. Here I review the 【32】______ scientific obstacles confronting the development of an effective HIV vaccine, and I consider 【33】______ strategies to overcome these obstacles.
It is instructive to consider the circumstances that have 【34】______ to past successes in vaccine development. The smallpox vaccine is 【35】______ the most successful inventions in the history of 【36】______ Why, 200 years ago, without the benefit of modern biotechnology, did the smallpox vaccine succeed so readily while an AIDS vaccine 【37】______ elusive? The answer lies in an experiment of nature that provided, to an astute observer, a clear direction for smallpox vaccine development. In this classic story of 【38】______ discovery, Edward Jennet noticed that milk maids who had previously contracted cowpox were 【39】______ to smallpox infection. This observation was the critical event leading to the finding that the cowpox virus cross-reacted immunologically with the smallpox virus and could 【40】______ be used to protect against smallpox.
【40】
选项
A、safely
B、therefore
C、as well
D、possibly
答案
B
解析
根据上下文可知,空格前是因果关系,故应填therefore表所以。
转载请注明原文地址:https://jikaoti.com/ti/hYisFFFM
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
Whatwasthefirststepinfightingagainstinfectiousdisease?
Whatwasthefirststepinfightingagainstinfectiousdisease?
NoiseisAmerica’smostwidespread______.
NoiseisAmerica’smostwidespread______.
Forthispart,youarerequiredtowriteacompositiononthetopic"OnDevelopingTourism".Youshouldwritecoherentlyandnea
In1971therewereabout3,700millionpeopleintheworld.Ifthepopulationwere【C1】______evenlyovertheearth’ssurfacet
In1971therewereabout3,700millionpeopleintheworld.Ifthepopulationwere【C1】______evenlyovertheearth’ssurfacet
In1971therewereabout3,700millionpeopleintheworld.Ifthepopulationwere【C1】______evenlyovertheearth’ssurfacet
随机试题
茶叶中儿茶素类的测定一般采用()。
Thereare【C1】_____homesinChinatodaythatdonothaveaTVset.Mostpeople,oldandyoung,liketospendsometimewatchingT
女性患者,50岁,诊断Addison病2年,用激素替代治疗,因外出工作紧张,劳累,终止药物治疗,出现恶心、呕吐、腹痛、腹泻、高热,化验检查:血钠122mmol/L,血糖2.8mmol/L。以下哪项化验检查在该患者中不能出现
确诊膀胱肿瘤最重要的检查方法是
A.β2受体激动剂B.β2受体阻滞剂C.抗胆碱能药D.糖皮质激素E.白三烯调节剂倍氯米松属于
初孕妇,26岁。现妊娠3l周,自述稍做体力劳动觉心悸、气短。能提示患器质性心脏病的检查结果为
小脑疾患,步态呈
设某企业销售三种不同类型的可比商品,其销售量和价格资料如下:根据上述资料请回答:商品销售量综合指数的计算结果为()。
A、9.1%B、10%C、15%D、21%B观察图表,只有财政收入预警发生了变化,从红色变为黄色,因为总共有10个指标(预警指数不算一项),所以2008年6月,发生变化的比例是1÷10×100%=10%。故选B。
【T1】______areactually【T2】______.Whiletheyare,perhaps,【T3】______tomeaningincommunicationinthesamewayasgrammaror
最新回复
(
0
)