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
39
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、since
B、at
C、in
D、after
答案
A
解析
since引导的时间状语从句,主句应用现在完成时。
转载请注明原文地址:https://jikaoti.com/ti/KTgsFFFM
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
1.Theterm"jointinternationalbusinessventure",jointventureforshort,hascometomeanmanythingstomanypeople.Itsom
1.WhenChristopherColumbusLandonAmerica’sshores,heencounteredcopper-shinnedpeoplewhomhepromptlycalled"Indians".C
Ifyouintendusinghumorinyourtalktomakepeoplesmile,youmustknowhowtoidentifysharedexperiencesandproblems.Your
Ifyouintendusinghumorinyourtalktomakepeoplesmile,youmustknowhowtoidentifysharedexperiencesandproblems.Your
Itisnaturalforyoungpeopletobecriticaloftheirparentsattimesandtoblamethemforthemostofthemisunderstandings
Peoplewhoareusedtotakingdrugsormedicinewhentheyareill,orwhoexpecttohaveanoperationinahospital,findtheid
Readthefollowingpassageandanswerquestions9-18.1.FromDr.R.S.ScorerofBritain’sImperialCollegeoftheSciencecomes
BillBrysonIwasbornintheU.K.,butIhavewrittenseveraltravelbooksaboutChina.IlivedinBeijingwithmywifean
Whenyouhavefinishedplayingfootball,youwantashowerbecauseyoufeellikethis.d______
Accordingtothepassage,physical,mental,andemotionalhealthareInviewofthebasicprinciplesofnaturalhealthcare,wh
随机试题
设z=x2f(),且f可微,求dz.
决定硬膜外阻滞平面的最主要因素是_____。
碘解磷定
某仲裁机构对甲公司与乙公司之间的合同纠纷进行裁决后,乙公司不履行仲裁裁决。甲公司向法院申请强制执行,乙公司申请法院裁定不予执行。经审查,法院认为乙公司的申请理由成立,裁定不予执行该仲裁裁决。对此,下列说法错误的是:()
求取土地收益及确定()是收益还原法的关键。
净化空调系统的终端过滤设备和净化设备的核心是()。
会计记录所使用的文字只能是中文,不允许使用民族文字或外国文字。()
著作权中,()的保护期不受限制。
结合我省实际,谈谈如何进行依法治省?
--Wouldyouliketogopicnickingwithustoday?--______,butitlookslikerain.
最新回复
(
0
)