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, a potential wonder drug that is proving to be eff
For several years, scientists have been testing a substance called interferon, a potential wonder drug that is proving to be eff
admin
2014-04-23
40
问题
For several years, scientists have been testing a substance called interferon, 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 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 potent 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 Karohnska Institute, has treated more than one hundred cancer patients with the new drug. Among a group of selected patients who had undergone surgical procedures for advanced cancer, half were given conventional treatments and the other 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 had 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 is produced by________.
选项
A、infecting viruses, bacteria, and tumors with a drug
B、infecting proteins with a virus
C、infecting white blood cells with a virus
D、infecting viruses with proteins
答案
C
解析
文中第二段倒数第二句说:“这种药物是通过一种病毒感染白细胞制造出来的。”由此看出,选项C符合文章内容。
转载请注明原文地址:https://kaotiyun.com/show/iEWO777K
0
在职攻硕英语联考
相关试题推荐
Theboycouldnotreconcilehimselftothefailure.Hedidnotbelievethatwashislot.
Inthatcountry,hospitaldoctorsdon’tgosightseeingveryoftenbecausetheirwork______almostalltheirtime.
Untilmeninventedwaysofstayingunderwaterformorethanafewminutes,thewondersoftheworldbelowthesurfaceofthesea
Withinhoursofappearingontelevisiontoannouncetheendofconscription,PresidentJacquesChiracmovedquicklytopreventa
Withinhoursofappearingontelevisiontoannouncetheendofconscription,PresidentJacquesChiracmovedquicklytopreventa
Standardusageincludesthosewordsandexpressionsunderstood,used,andacceptedbyamajorityofthespeakersofalanguagei
Weareenteringaperiodinwhichrapidpopulationgrowth,thepresenceofdeadlyweapons,anddwindlingresourceswillbringin
Fromthegoosethatlaidthegoldeneggtotheracebetweenthetortoiseandthehare,Aesop’sfablesareknownforteachingmor
Woman:Whatdoyouliketodoonyoursummervacation?Man:Ilikenothingbetterthanfishingonahotsummerday.Question:What
随机试题
有限责任公司和股份有限公司的设立有一些相同之处,下列说法中正确的有()。
杜摩兰的()原则,现在已成为选择契约准据法的一项普遍接受的原则。
在PowerPoint演示文稿中,在插入了一张来自文件的图片后,可以对该图片进行复制、移动、删除、改变大小等操作。()
关于A房地产公司与某市政府之间订立的土地使用权出让合同,下列说法错误的是()。关于A房地产公司未如期动工开发,下列说法正确的是()。
城市道路路面的使用要求指标包括()。
现浇混凝土质量评价的主要内容是其()。
发审委会议表决采取记名投票方式,同意票数达到()票为通过。
布置课外作业的目的是()。
设随机变量Xi(i=1,2)同分布,且满足P{X1X2=0}=1,则X1与X2()
InFrance,allschoolsfollowthesamebasiccurriculum.Frenchchildrenenterschoolattheageof6.
最新回复
(
0
)