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
100
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://kaotiyun.com/show/Xomd777K
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
Ifyouintendusinghumorinyourtalktomakepeoplesmile,youmustknowhowtoidentifysharedexperiencesandproblems.Your
Itisnaturalforyoungpeopletobecriticaloftheirparentsattimesandtoblamethemforthemostofthemisunderstandings
Whatdowethinkofwhenweheartheword"business"?Someofusthinkofourjogs,othersofthemerchantstheydealwithasco
1.TheUSeconomy,whichmakesuponequarterofworldeconomicoutput,isslowingsharply,andbringingdowngrowththroughthe
Readthefollowingpassageandanswerquestions9-18.1.FromDr.R.S.ScorerofBritain’sImperialCollegeoftheSciencecomes
Theexaminerasksyouandyourpartnerquestionsaboutyourselves.Youmaybeaskedaboutthingslike’yourhometown’,’yourin
Lindawantstochangeacassettebecauseshedislikesit.Lindaishappywithhercassetteplayer.
Writeacardtosendtoyourfriend,Inyourcard,youshould•inviteyourfriendtotheparty•saywhenitwilltakeplace•
Whattimedothephotographyclassesbegin?Philip’shappywiththecoursebecausehe’s
随机试题
H1受体阻滞药不能治疗的疾病是
计算机通过主机内的()来控制、指挥和监督其他部分,使一切事务处理得有条不紊。
以下哪一种技术属于频谱多普勒技术
设备采购合同属于()合同。
(操作员:刘主管;账套:101账套;操作日期:2015年1月1日)设置固定资产类别。固定资产类别编码:2固定资产类别名称:专用设备折旧类型:正常计提折旧折旧方法:平均年限法预计使用年限:5年
行政给付的内容是赋予被帮助人()。
本次调查全部网民数约为()万人。本次调查50岁以上的网民有()万人。
两台主机处于掩码为255.255.255.224的同一子网中。如果一台主机的IP地址为205.113.28.85,那么另一台主机的IP地址可以为()。
Youcanstretchyourlegsonthespaciousdecks,playgames,swimandenjoygoodfood—always______,ofcourse,thattheseai
ThefloodofwomenintothejobmarketboostedeconomicgrowthandchangedUSsocietyinmanyways.Manyin-homejobsthatused
最新回复
(
0
)