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
8
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
TheAmericanbabyboomafterthewarmadetheU.S.adviceunconvincingtop
[originaltext]M:I’mterriblysorryI’vebrokenyourcup.I’llbuyyouanewon
StudentexpeditionsdoagreatdealofgoodworkontheArcticislandsbutf
决定远曲小管和集合管上皮细胞对水通透性最重要的激素是()A.血管升压素 B
A.Ⅰ、Ⅲ B.Ⅱ、Ⅲ C.Ⅰ、Ⅳ D.Ⅱ、Ⅳ
尿沉渣涂片如下图示,箭头所指的是()。 A.磷酸钙结晶 B.碳酸钙结晶
目前商品流通企业常用的物流信息技术主要有()等。A:条码技术 B:MRP技术
采用标准贯入试验进行砂土液化复判时,下列说法中正确的选项有哪些?( )A.按照
课程论侧重研究()。 A.教什么B.为谁教 C.如何教D.为
药品的包装系指选用适当的材料或容器、利用包装技术对药物制剂的半成品或成品进行分(
最新回复
(
0
)