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
2023-07-10
37
管理
问题
Scientists have long thought about the idea of replacing a diseased organ with a healthy one from a donor.[33]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.
33. What was the problem of organ transplant at the beginning?
34. In what condition would rejection not occur?
35. 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
短文提到科学家最后发现如果捐献器官者和接受器官的人是同卵双胞胎,就不会发生排斥现象。故A正确。
转载请注明原文地址:https://tihaiku.com/zcyy/2825938.html
相关试题推荐
ScientistsinIndiahavediscoveredawaytomakebambooplantsproduceflowe
[originaltext]Millionsofwordshavebeenwrittenaboutyoungpeopleinthe
[originaltext]TheLondonbombingswillcosttheUKupto3billionpoundsa
[originaltext]IhadspentmylastdayinLondonvisitingfriends,takingpi
[originaltext]IhadspentmylastdayinLondonvisitingfriends,takingpi
[originaltext]IhadspentmylastdayinLondonvisitingfriends,takingpi
[originaltext]M:Doyoureallyhavetogodowntothelaketogetallyourwate
[originaltext]M:Doyoureallyhavetogodowntothelaketogetallyourwate
[originaltext]M:Doyoureallyhavetogodowntothelaketogetallyourwate
[originaltext]M:Doyoureallyhavetogodowntothelaketogetallyourwate
随机试题
Whichofthefollowingsentencesexpressesafutureaction?A、Karliscontinually
Itisthedutyofeverycitizentodefendhiscountrywhenit(attack)______byt
有一患者长期饮酒,而后出现肝区疼痛,该患者肝脏的主要病变可能是哪项()A
关于工作分解结构(WBS)和工作包的描述,不正确的是( )。A.工作分解结构必
2019年,G省完成邮政业务总量4403.44亿元,占全国的27.1%,比上年增
A.强的松 B.雄激素 C.EPO D.叶酸及维生素B E.琥珀酸亚铁治
根据五味的作用,请判断下列药物中哪组完全属于辛味药A.干姜、细辛、诃子 B.红
甲、乙、丙三人签订合伙协议并开始经营,但未取字号,未登记,也未推举负责人。其间,
某软件公司规模不断发展壮大,员工人数已从原来的20多人增加到现在的400多人,但
某工程公司承接了新建30公里PVC塑料管道工程。项目部组织技术人员现场勘察后写了
最新回复
(
0
)