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
34
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
Thediscussionwassoprolongedandexhaustingthat______thespeakersstoppedforrefreshments.
【M1】TheeconomicgrowththatmanynationsinAsiaandincreasinglyAfricahaveexperiencedoverthepastcoupleofdecadeshast
Thecontributiongenesmakeintelligenceincreaseaschildrengrowolder.Thisgoesagainstthenotionthatmostpeopleholdtha
Informationtechnologythathelpsdoctorsandpatientsmakedecisionshasbeenaroundforalongtime.CrudeonlinetoolslikeW
WhereIstheNewsLeadingUs?NotlongagoIwasaskedtojoininapublicsymposiumonthevoleoftheAmericanpress.Two
Forgetfootball.Atmanyhighschools,thefiercestcompetitionisbetweenCokeandPepsioverexclusive"pouringrights"tosel
RichardSatava,programmanagerforadvancedmedicaltechnologies,hasbeenadrivingforcebringingvirtualrealitytomedicine
____intheirislandcommunity,thevarioustribesusedlanguageswhichbecamemoreandmoresimilartoeachother’s.
Itwasarulingthathadconsumersseethingwithangerandmanyafreetradercryingfoul.OnNovember20ththeEuropeanCourt
随机试题
一国出口商以低于商品正常价值的价格,将商品出口到另一国市场的行为在国际贸易中被称为()
有权直接发布通缉令的机关是
尿激酶具有下列特点:
噬菌体属于
桥梁长度是指()。
据医生介绍,干眼症症状是眼睛干涩、发红、怕光,看东西伴有刺痛感,眼睛容易疲劳。现在很多办公室一族白天在空调房对着电脑,晚上回家一进门就打开空调,很容易得干眼症。所以说,“空调+电脑”是干眼症的双重诱发因素。以下哪项如果为真,最能支持上述结论?()
(2012年上海.A卷.114)《中共中央关于制定国民经济和社会发展第十二个五年规划的建议》要求,“十二五”期间,我国将全面提高信息化水平,实现“三网融合”。这里的“三网”是指()。
设函数f(x)=且λ>0,则∫—∞∞xf(x)dx=________。
Inotifiedhimthatmyaddresshadchanged.
1.(a)Statethemainfunctionofthefollowingdocuments:(i)billoflading(ii)certificateofinsurance(iii)cer
最新回复
(
0
)