首页
登录
职称英语
[originaltext] Scientists have long thought about the idea of replacing a di
[originaltext] Scientists have long thought about the idea of replacing a di
游客
2023-07-08
10
管理
问题
Scientists have long thought about the idea of replacing a diseased organ with a healthy one from a donor. The problem at first was that the human body is not particularly receptive to foreign tissue. When tissue from a donor is placed inside the body, the immune army sees it as a foreign invader and goes into battle mode. White blood cells attack and destroy the unknown tissue in a process known as rejection.
Eventually, scientists realized that the problem of rejection didn’t occur when the organ donor and recipient were identical twins. The genetic similarity appeared to prevent the immune response. Massachusetts surgeon Joseph E. Murray used this concept to his advantage in 1954, when he accomplished the first successful kidney transplant between identical twins.
Dr. Murray’s surgery was a major breakthrough, but it wasn’t a solution. After all, very few people have an identical twin they can rely on for organ donation. In the late 1960s, doctors figured out a way to perform transplants between non-relatives by suppressing the recipient’s immune response with drugs. But the trouble was that the drugs were highly poisonous. Between the risks of infection and the poisonous drugs, most transplant patients didn’t live long after their operation.
By the 1980s, anti-rejection drugs had improved to the point where transplantation surgery became pretty routine and far less risky. Survival rates rose. Once surgeons became experienced in transplanting essential organs such as heart, kidneys, liver and lungs, they turned their focus to "nonessential" parts of the body.
23. What was the problem of organ transplant at the beginning?
24. In what condition would rejection not occur?
25. What did surgeons do after they got familiar with the transplant of essential organs?
选项
A、Surgeons were not sure of the risk of operation.
B、It’s very hard to find a suitable organ donor.
C、Human body was not receptive to foreign tissue.
D、Patient’s white blood cells would be destroyed.
答案
C
解析
短文提到器官移植早期遇到的问题是人的身体不接受外来的组织(not...receptive to foreign tissue),导致了排斥现象(rejection)的产生,C与短文内容一致,故为答案。
转载请注明原文地址:https://tihaiku.com/zcyy/2819058.html
相关试题推荐
[originaltext]ArthurMillerisuniversallyrecognizedasoneofthegreates
[originaltext]Cellphonehasbecomepartoftherestauranttablesettingbe
[originaltext]"TellMeAboutYourself"isthemostpopularwayforhiring
[originaltext]"TellMeAboutYourself"isthemostpopularwayforhiring
[originaltext]"TellMeAboutYourself"isthemostpopularwayforhiring
[originaltext]M:YouareawardedtheCNNHerooftheYear,Ms.Liz.Congratulat
[originaltext]M:YouareawardedtheCNNHerooftheYear,Ms.Liz.Congratulat
[originaltext]W:(19)Sorry,I’mlate.Thetrainwasdelayed.Igotstuckonthe
[originaltext]W:(19)Sorry,I’mlate.Thetrainwasdelayed.Igotstuckonthe
[originaltext]M:HaveyouheardthatPeter’svacationplanswentupinsmokewh
随机试题
Forthispart,youareallowed30minutestowriteashortessayentitledOn
WhenandwherewasthefirstWorldCupplayed?[br][originaltext]On26May,
Insome【S1】______centers,workaholismissocommonthatpeopledonot【S2】___
[originaltext]Peopleovertheageof65intheUSAarecalledseniorcitize
在计息、贴现方式相同情况下,债券价格、必要收益率与息票利率之间的关系表述错误的是
35kV及以下的三芯电缆运行时,最小弯曲半径为:有铠装();无铠装()。
下列做法中,属于社会工作者对同事的伦理责任是()。A.公正与服务 B.团队内相
简述现代企业人力资源管理各个历史发展阶段的特点。
A.酸值加皂化值 B.皂化值减酸值 C.酸值减皂化值 D.羧酸和酚类成分总
男,46岁。近3个月出现尿频、尿急,排尿迟缓、断续,既往体健,应采取的治疗措施A
最新回复
(
0
)