首页
登录
职称英语
[originaltext]Scientists have long thought about the idea of replacing a diseas
[originaltext]Scientists have long thought about the idea of replacing a diseas
游客
2023-06-26
37
管理
问题
Scientists have long thought about the idea of replacing a diseased organ with a healthy one from a donor. [23] 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. [24] 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. [25] 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.
Questions 23 to 25 are based on the passage you have just heard.
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、The donor and recipient are identical twins.
B、The transplanted organ is from the recipient’s relatives.
C、The donor’s blood type is the same as the recipient’s.
D、The recipient is not infected during the operation.
答案
A
解析
转载请注明原文地址:https://tihaiku.com/zcyy/2784354.html
相关试题推荐
We’veBeenImaginingMountainsAllWrong,SayScientistsA)Fromthesimp
We’veBeenImaginingMountainsAllWrong,SayScientistsA)Fromthesimp
We’veBeenImaginingMountainsAllWrong,SayScientistsA)Fromthesimp
We’veBeenImaginingMountainsAllWrong,SayScientistsA)Fromthesimp
We’veBeenImaginingMountainsAllWrong,SayScientistsA)Fromthesimp
[originaltext](22)Afewdegreescanmakeabigdifferencewhenitcomesto
[originaltext](22)Afewdegreescanmakeabigdifferencewhenitcomesto
[originaltext]Acommonchallengeformanyteachersiskeepingtheirstudent
[originaltext](16)Itiswhatfaileddietershavelongsuspected:Fatpeopl
[originaltext](16)Itiswhatfaileddietershavelongsuspected:Fatpeopl
随机试题
Peopletendtocomplainalotaboutthe______risingpricesrecently.A、steeply
Wehadameetingandtalkedthematteroverfacetofaceforfearthattheremig
Mysistersaidthathernewboyfriendwasthelivingend.Theunderlinedpartme
当两种证券投资收益率之间完全正相关时,两种证券之间的相关系数为()。A.
权益净利率在杜邦分析体系中是个综合性最强、最具代表性的指标,许多投资者也将此指标
沿海某市为了港口建设,需要对甲地到乙地距海岸线10km水域进行水下地形测量。获取
证券公司受期货公司委托从事介绍业务,应当提供()服务。A.通过证券资金账户
某省级煤矿安全监察机构在进行煤矿隐患排查时,发现甲煤矿存在重大事故隐患,当即下达
调整项目组织结构、进行管理职能分工,属于项目目标动态控制纠偏措施中的()。A.
根据《建筑起重机械安全监督管理规定》,下列建筑起重机械不得出租、使用的有(
最新回复
(
0
)