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
43
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://jikaoti.com/ti/R1bYFFFM
0
考博英语
相关试题推荐
Evenresearchers,forexample,______applyingtheconceptof"cohesion"maynotproducethemostcost-effectivescience.
Themostconvincingevidencefortheimportanceofadultinfluenceonachild’sintelligencecomesfromastudyof"atrisk"chi
Theconceptof______groupingofpeoplewithsimilarinterestsandabilitieswasverypopularamongeducators.
Youknowyoushoulddoit,otherpeopledoitallthetime.Maybeyou’vealreadydoneitbutitwasn’tverysatisfying,andyou
Thehostess______themaid______thetablefordinnerwhilewearrivedafterathree-hourdrivefromthetown.
Theyhitonlythesmallerpeoplelikeme,whilethepoliticianswillofcourse______itwithmoney.
Therearesomanybadthingsaboutwomendrivers,Idon’tknowwheretostart.IguessIwillgetthebailrollingbytalkingab
HerofficeintheFirstNationalBankbuildingisprovisional.
Theshortageofwaterbecamemore______thissummerwiththehighesttemperaturesin40years.
Althoughtheworkneedstobedonemoreexhaustively,effortshavebeenmadetocollectthesongsandballadsoftheAmericanRe
随机试题
若物系的界面张力σ与两相密度差△ρ的比值(σ/△ρ)大,宜选用()萃取设备。
体内氨的储存和运输的重要形式是
调制箍围药,取其清凉解毒作用的,应选用()
甲国有独资公司、乙股份有限公司与自然人张某、王某共同出资设立了丙有限合伙企业,甲公司和王某是有限合伙人,乙公司和张某是普通合伙人,合伙协议约定由张某执行合伙企业事务,并且约定甲公司可以自由转让自己在合伙企业中的财产份额,对甲公司、乙公司和张某就合伙企业份额
监理合同履行过程中,合同当事人承担违约责任的原则不包括( )。
决策的定量分析方法中,针对不确定型决策的有()。
赤壁之战
workingcapital
一个罐子里装有黑球和白球,黑、白球数之比为a:1。现有放回的一个接一个地抽球,直至抽到黑球为止,记X为所抽到的白球个数.这样做了n次以后,获得一组样本:X1,X2,…,Xn。基于此,求未知参数a的矩估计和最大似然估计.
Peopletendtobemoreimpressedbyevidencethatseemstoconfirmsomerelationship.Thusmanyare【B1】______theirdreamsarepr
最新回复
(
0
)