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
2017-03-25
76
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 largescale 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。其他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/YaGO777K
0
考博英语
相关试题推荐
Thestudyofgeneticshasgivenrisetoaprofitablenewindustrycalledbiotechnology.Asthename【C1】______,itcombinesbiolo
TheCarnegieFoundationreportsaysthatmanycollegeshavetriedtobe"allthingstoallpeople".Indoingso,theyhaveincre
Thetownplanningcommissionsaidthattheirfinancialoutlookforthenextyearwasoptimistic.Theyexpectincreasedtax______
Surveyshaveshownthatmostfootballandbasketballinjuriesinvolvetheknee,eitherthroughtwistingorthroughapplicationo
Citiesdevelopasaresultoffunctionsthattheycanperform,somefunctionsresultdirectlyfromtheingenuityofthecitizenr
"Sloganeering"didnotoriginateinthe1960s.Thetermhasarichhistory.ItoriginatedfromtheGaelicwordslaughgharim,whi
Therearefourbasictypesofcompetitioninbusinessthatformacontinuumfrompurecompetitionthroughmonopolisticcompetiti
Ourpresentgenerationofculturalcritics,arrivingaftertheassaultofpostmodernismandtheincreasinglywidespreadcommerci
Ofallthecomponentsofagoodnight’ssleep,dreamsseemtobeleastwithinourcontrol.Indreams,awindowopensintoaworld
IntheUnitedStates,thefirstdaynurserywasopenedin1854.Nurserieswereestablishedinvariousareasduringthe【C1】______
随机试题
有关肠结核的并发症的描述不正确的是
某病人首次急性发作的腰椎间盘突出症,绝对卧床的时间至少应为
空气的线衰减系数是
产业技术政策的基本原则是()。
下列情形中,既违反会计法律制度,又违背会计职业道德规范的有()。
业务库存现金可用量的匡算不取决于()。
物业服务合同的标的是物业服务企业提供的()物业服务。
以下说法错误的是()。
Howlongyoulivehasalottodowithyourenvironmentandlifestyle,butexceptionallongevitymayhaveevenmoretodowithy
对于图书管理数据库,要查询借阅了两本和两本以上图书的读者姓名和单位,请对下面的SQL语句填空:SELECT姓名,单位FROM图书管理!读者;WHERE借书证号m(SELECT【】FROM图书管理!借阅;GROUPBY借书证号【
最新回复
(
0
)