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
For several years, scientists have been testing a substance called interferon (干扰素), a potential wonder drug that is proving to
admin
2012-10-23
77
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 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
细节题,问干扰素是如何产生的。由第2段倒数第2句“The drug is produced by infecting white blood cells with a virus,”可知正确答案是C选项。
转载请注明原文地址:https://kaotiyun.com/show/Jb9O777K
0
考博英语
相关试题推荐
InancientEgyptianpaintings,royalfiguresweredifferentiatedbymakingthemseveraltimeslargermanother.
Rescueworkerscontinuedthedelicatetaskofsiftingthroughtonsofconcreteandtotrytoreachpossiblesurvivors.
Theadvertisingindustryhasresortedtoself-regulationinaseriousefforttocurtailnotonlybadtastebutalsomisrepresent
Afterarunofseveralthousandyears,itisentirelyfittingthat2000willbemarkedastheyearthetideturnedagainsttaxat
A(Always)sincethecreationofcelluloid,B(plastics)havebeenfoundC(tohave)D(amultitude)ofindustrialandcommercialus
Whenwecreditthesuccessfulpeoplewithintelligence,physicalstrengthorgoodluck,wearemakingexcusesforourselvesbeca
ThesuddendemiseofBritain’soldestinvestmentbank______globalmarkets.
PeterPalumbo,chairmanoftheArtsCouncil,saidthenationalcompaniesweresosuccessfulcommerciallythatwhentherewasas
随机试题
国家秘密的密级分为()
CNG是指__________。
青年男性,胸部手术后,如切口无感染,其拆线时间为
妊娠图不包括:
申请设立外资企业,审批机关应当在收到申请设立外资企业的全部文件之日起( )内决定批准或者不批准。
赵某是甲科研所的工作人员,他承担了本单位的某项科技开发课题,研制一种冷凝机。在尚未研制成功时,赵某工作调动,调至乙科研院工作,赵某又利用乙科研院的设备及技术资料继续研制,终于将新型冷凝机研制成功。丙厂认为该冷凝机市场很大,遂向赵某提出转让该冷凝机技术的请求
π
A、他们喜欢骗人B、他们脾气不好C、他们要求太多D、他们会伤害我们D
Languageissaidtobearbitrarybecausethereisnologicalconnectionbetweenmeaningsand
From1760sonwards,therewasagreatchangeinthewaypeoplelived.Machineswere【B1】______thatcouldmakethingsmuchfaster
最新回复
(
0
)