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
For several years,scientists have been testing a substance called interferon (干扰素),.a potential wonder drug that is proving to b
For several years,scientists have been testing a substance called interferon (干扰素),.a potential wonder drug that is proving to b
admin
2012-06-18
42
问题
For several years,scientists have been testing a substance called interferon (干扰素),.a potential wonder drug that is proving to be effective in treating a variety of ailments,including virus infections,bacteria infections,and tumors. To date,the new drug has provoked no negative reaction of sufficient significance to discourage its use. But in spite of its success, last year only one gram Was produced in the entire world.
The reason for the scarcity lies in the structure of interferon. A species of specific protein,the interferon produced from one animal species cannot be used in treating another animal species. In other words, to treat human beings,only interferon produced by human beings may be used. The drug is produced by infecting white blood cells with a virus. Fortunately,it is so powerful that the amount given each patient per injection is very small.
Unlike antibiotics, interferon does not attack germs directly. Instead,it makes unaffected cells resistant to infection,and prevents the multiplication of viruses within cells.
As you might conclude,one of the most dramatic uses of interferon has been in the treatment of cancer. Dr. Hans Strander,research physician at Sweden’s famous Karolinska Institute,has treated more than one hundred cancer patients with the new drug. Among a group of selected patients who has undergone surgical procedures for advanced cancer, half were given interferon. The survival rate over a three-year period was 70 percent among those who were treated with interferon as compared with only 10 to 30 percent among those who have received the conventional treatments.
In the United States,a large-scale project supported by the American Cancer Society is now underway. If the experiment is successful, interferon could become one of the greatest medical discoveries of our time.
Interferon has not been widely used because it is_____.
选项
A、still very dangerous
B、not yet available in the United States
C、difficult to produce in large quantities
D、not effective for human beings
答案
B
解析
推理题。解题点在最后一段。文章最后提到“a large-scale project supported by the American Cancer Society is now underway.If the experiment is successful….”。据此可知,该药在美国尚在试验当中。既然是试验,自然就不可能大范围内使用了。所以正确答案是B选项。其它选项均可以在原文中找到相应的信息点,如A选项,文中未提到该药是危险的;C选项,文中没有说干扰素难以大量生产;D选项,瑞典的试验表明,与常规治疗方法相比,干扰素的治疗效果是明显的,故D项不对。
转载请注明原文地址:https://kaotiyun.com/show/4MnO777K
0
考博英语
相关试题推荐
Viewerssimplycanwatchwhatison______apresentationviaakeyboard,touchscreenormouse.
Therangeinfrequenciesofmusicalsoundsisapproximately20-20,000cyclespersecond(cy/sec),Somepeoplecanhearhigherf
TheElNino("littleboy"inSpanish)thatpoundedtheglobebetweenthesummersof1997and1998wasinsomemeasurethemostd
Bysuchdemarcation,strong,representativenationalsocietiescanthenbelefttodowhattheydobest-______youngscientists
71.Battlesarelikemarriages.Theyhaveacertainfundamentalexperiencetheyshareincommon.Theydifferinfinitely,butstil
Thesourcesofanti-Christianfeelingweremanyandcomplex.Onthemoreintangibleside,therewasageneralpiqueagainstthe
Therearesomanybadthingsaboutwomendrivers,Idon’tknowwheretostart.IguessIwillgetthebailrollingbytalkingab
Behindhislargesmilesandlargecigars,hiseyesoftenseemedto______regret.
TheSocialSecurityActdidnotincludehealthinsurancebecausethecommissionconsideredthatitsinclusionwouldjeopardizet
Thinkofallthecriminalswhohavekilled,allthesoldierswhohavekilled;considerthemassmurderofJewsinNaziGermany.
随机试题
情景模拟法
A.细菌性肝脓肿B.门静脉炎C.两者均可D.两者均不可急性阑尾炎时可并发
经期小腹冷痛,喜温喜按,经量少,色黯淡,腰膝酸软,中医辨证为:经后小腹隐痛,阴部空坠,喜按,月经量少,色淡,质稀,中医辨证为:
性兴奋时润滑阴道口的分泌物来自于
通常认为货币政策目标的选取要符合三个标准或兼备三个基本要求,即:()。
某项目年净利润100万元,上交所得税20万元,列入成本中的利息15万元,项目建设投资600万元,流动资金200万元。该项目总投资收益率为()。
球罐的沉降试验中,支柱基础沉降应均匀。放水后( )。
关于用益物权和担保物权,下列说法正确的是()。
社会政策:以公正为理念依据,以解决社会问题、保证社会成员的基本权利、改善社会环境、增进社会的整体福利为主要日的,以国家的立法和行政干预为主要途径而制定和实施的一系列行为准则、法令和条例的总称。下列不符合社会政策定义的一项是:
清代画家郑燮在《竹石》中写道:“千磨万击还坚劲,任尔东西南北风”,这句诗体现的哲学道理是:
最新回复
(
0
)