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
2024-01-28
56
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、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
转载请注明原文地址:https://tihaiku.com/zcyy/3400613.html
相关试题推荐
[originaltext]AtavastdumpsiteinthewestofGhana’scapitalAccra,smallfi
[originaltext]TheUSmilitarysaysjointairstrikesinSyriaandIraqhavekil
[originaltext]Somepeoplethinkthatthebesttimetobeginstudyingaforei
[originaltext]Somepeoplethinkthatthebesttimetobeginstudyingaforei
[originaltext]TheaverageAmericanwillmove13timesinhislifetimeandm
[originaltext]Cattlehaveservedhumanitysinceprehistoricdaysasbeastso
[originaltext]W:So,you’llbegettingdresseduplater—beforeyougototheBB
[originaltext]W:So,you’llbegettingdresseduplater—beforeyougototheBB
[originaltext]W:So,you’llbegettingdresseduplater—beforeyougototheBB
[originaltext]W:Excuseme.MywatchstoppedrunningandI’mnotsurewhat’s
随机试题
情景:你们戏剧小组(dramagroup)要举行会议来讨论“英语之夜”出演的戏剧(play)。任务:请你就此用电子邮件给王教授写一封50词左右的邀请
Thepresident’s______remarksinhisspeechmetwithalotofattacksfromothe
Allofthefollowingaretrueexceptthat______.[br]Thosewhoviolatedthera
肾上腺素的生理作用包括()。A.使心跳加快,心肌收缩力增强,心输出量增加
A.f(-x,y)=f(x,y),f(x,-y)=-f(x,y) B.f(-x
狂犬病患者咽肌痉挛发作最常见的诱发因素是()。A.流水声 B.强光 C.噪
A. B. C. D.
下列关于流动性比例的叙述中,错误的是()。A.流动性比例的计算公式为:流动性比例
共用题干 一般资料:求助者,男性,21岁,大学三年级学生,因担心毕业找不到工作
女,36岁。因急性一氧化碳中毒入院,治疗1周后症状消失出院。2月后突然出现意识障
最新回复
(
0
)