首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Throughout the world there is a shortage of human organs for transplants. In Britain, for example, 6000 people are waiting for o
Throughout the world there is a shortage of human organs for transplants. In Britain, for example, 6000 people are waiting for o
admin
2011-01-06
49
问题
Throughout the world there is a shortage of human organs for transplants. In Britain, for example, 6000 people are waiting for organs ——5000 for kidneys, and the (51) for hearts, lungs and livers. (52) , only about 1750 kidney, 500 heart and lung, and 650 liver transplants are (53) each year. And the waiting (54) increases at five percent a year. In the United States only half of the 30000 in need of organs (55) them.
Hence the great interest in animal-to-human transplants, known as xenografts or xenotransplants (from the Greek work xenos, meaning strange of foreign) (56) most scientists believe is the only long-term solution to the organ (57) . There have been attempts at xenotransplants (58) the beginning of this century but neither has been successful; the longest (59) was a 20-day-old baby called Fae, who in 1984 was (60) the heart of a baboon.
The main (61) with any organ transplant is that the immune system of the patient receiving the organ sees the transplant organ (62) an invader. The immune system therefore launches a massive attack on the invader, activating enzymes knows as complement, which attack the (63) body, eventually killing the patient as well. This rejection has been (64) when transplanting human organs between humans by the close matching of tissue and the long-term use of drugs known as immuno-suppressants, first introduced just over ten years ago. With xenotranplants, however, rejection is even more (65) ; a normal pig’s heart, for example, transfuses with human blood can be destroyed in 15 minutes.
选项
A、Therefore
B、However
C、So
D、otherwise
答案
B
解析
however起转折作用。
转载请注明原文地址:https://kaotiyun.com/show/Romd777K
本试题收录于:
职称英语卫生类B级题库职称英语分类
0
职称英语卫生类B级
职称英语
相关试题推荐
Earlyonemorning,morethanahundredyearsago,anAmericaninventorcalledEliasHowefinallyfellasleep.【R1】______Butheha
1.Thefilmisnotwithoutitsdrawbacks.Disappointment,failure,selfdoubt,regretsoveropportunities,missedormisusedthe
1.Thefilmisnotwithoutitsdrawbacks.Disappointment,failure,selfdoubt,regretsoveropportunities,missedormisusedthe
Peoplewhoareusedtotakingdrugsormedicinewhentheyareill,orwhoexpecttohaveanoperationinahospital,findtheid
ThecathasprobablybeenassociatedwithMansinceitwasfirstgivenaplacebyhisfireinreturnforkeepingthecavedwelli
1.TheUSeconomy,whichmakesuponequarterofworldeconomicoutput,isslowingsharply,andbringingdowngrowththroughthe
1.Workingparentsandteachersseeafter-schoolprogramsnolongerasoptional,butasanessentialsupportforchildrenasthe
CONVERSATION2(Questions5-8)Thewomanisworkingatthecampus【L5】______office.Themancanworkatleast【L6】______hoursawee
Thingswillbedifferentifyoumakeasoundchoice.
NaturalHealthCareNaturalhealthcareisaphilosophyandasetofprinciplesandpracticesbasedonsciencethatleadtoane
随机试题
树立社会主义荣辱观具体落实到每个社会成员,就是要努力学习和践行社会主义荣辱观。学习和践行社会主义荣辱观要
_____isunknowntousall.
该病人烧伤面积约为根据病情判断烧伤严重程度为
行政机构的含义不包括()。
工程量清单体现的是( )单价。
自动喷水灭火系统具有()的特点。
Inlargepartasaconsequenceofthefeministmovement,historianshavefocusedagreatdealofattentioninrecentyearsonde
(1)在名称为Form1、标题为“鼠标光标形状”的窗体上画一个名称为Text1的文本框。请通过属性窗口设置适当属性,使得程序运行时,鼠标在文本框中时,鼠标光标为箭头(Arrow)形状;在窗体中其他位置处,鼠标光标为十字(Cross)形状。注意:存
Intheeighteenthcentury,Japan’sfeudaloverlords,fromtheshoguntothehumblestsamurai,foundthemselvesunderfinancials
Duringexaminationscandidatesarealwayssupposedtostayinseats,keeptheireyesonthework,______toanyone.
最新回复
(
0
)