首页
登录
职称英语
For several years, scientists have been testing a substance called interfero
For several years, scientists have been testing a substance called interfero
游客
2025-04-05
31
管理
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. [br] 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://www.tihaiku.com/zcyy/4027008.html
相关试题推荐
Agreatdealofattentionisbeingpaidtodaytotheso-calleddigitaldivid
Agreatdealofattentionisbeingpaidtodaytotheso-calleddigitaldivid
Agreatdealofattentionisbeingpaidtodaytotheso-calleddigitaldivid
Agreatdealofattentionisbeingpaidtodaytotheso-calleddigitaldivid
Agreatdealofattentionisbeingpaidtodaytotheso-calleddigitaldivid
Agreatdealofattentionisbeingpaidtodaytotheso-calleddigitaldivid
TheGreek’sloftyattitudetowardscientificresearch—andthescientists’co
TheGreek’sloftyattitudetowardscientificresearch—andthescientists’co
Acorpsofso-calledbarefootdoctorsaretrainedinhygiene,preventivemedicin
Asa______actor,hecanperform,sing,danceandplayseveralkindsofmusicali
随机试题
Overtheyears,I’veheardafairnumberofslursshoutedatcampuscops.S
Astothesupportingactress,shehasa(beautiful)______facethantheheroine
Somemarriagesseemtocollapsesosuddenlythatyou’dneedacrystalballt
以下关于项目估算的叙述中,不正确的是( )。A.需要估算的项目参数包括项目规模
A.多黏菌素 B.四环素 C.阿奇霉素 D.链霉素 E.青霉素可诱发药源
A.小青龙汤 B.平喘固本汤合补肺丸 C.葶苈大枣泻肺汤合桂枝茯苓丸 D.
讲作画应以“六法”为标准,后世奉为典范的画论是()。A.《论画》 B.《画品
病人发热恶寒,兼见便秘、尿赤等表现者属于A:表证B:里证C:寒证D:热证
问渠哪得清如许∶为有源头活水来A.蝉噪林逾静∶鸟鸣山更幽 B.不识庐山真面目∶
血清中含有抗A、B凝集素的是A、A型 B、B型 C、AB型 D、O型 E
最新回复
(
0
)