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
67
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
1.WhenChristopherColumbusLandonAmerica’sshores,heencounteredcopper-shinnedpeoplewhomhepromptlycalled"Indians".C
1.Thefilmisnotwithoutitsdrawbacks.Disappointment,failure,selfdoubt,regretsoveropportunities,missedormisusedthe
1.TheUSeconomy,whichmakesuponequarterofworldeconomicoutput,isslowingsharply,andbringingdowngrowththroughthe
1.Workingparentsandteachersseeafter-schoolprogramsnolongerasoptional,butasanessentialsupportforchildrenasthe
IDCardForanewstudent,theIDcardwillbemailedtohis/hermailingaddressapproximately【L5】______workingdaysafterh
Whenvisitingmuseumsnowadays,peoplecantakepartinmanyactivities.NewYork’sAmericanMuseumofNaturalHistoryisopene
Onaveragewomenlivedlongerthanmen100-yearsago.Ahundredyearsagomanykidsdiedatanearlyage.
Accordingtothepassage,physical,mental,andemotionalhealthareInviewofthebasicprinciplesofnaturalhealthcare,wh
NaturalHealthCareNaturalhealthcareisaphilosophyandasetofprinciplesandpracticesbasedonsciencethatleadtoane
随机试题
焊接电缆是采用多股细____制成。
企业收到银行收款通知,对该境外销货单位开出的信用证余款245000元已经转回银行账户。企业编制会计分录:
乌梅丸亦可辨证应用于
龙胆草的性能特点为
从外单位取得的原始凭证遗失时,必须取得原签发单位盖有公章的证明,并注明原始凭证的号码、金额、内容等,由经办单位会计机构负责人、会计主管人员审核签章后,才能代作原始凭证。
(2019年)甲公司记账本位币为人民币,外币业务采用交易发生日的即期汇率折算,按月计算汇兑损益。3月11日出口一批价值10万美元的商品,收款期限30天。当日即期汇率为1美元=6.28元人民币。3月31日的即期汇率为1美元=6.30元人民币。4月10日如期收
下列各项中,不得在企业所得税前扣除的项目有()。
“君子耻其言而过其行”翻译为“君子以他所说的超过他所做的为可耻”,这在当今社会仍具有强烈的教育意义。这句话出自()。
将考生文件夹下DAY\TIME文件夹中的文件TODAY.BAS移动到考生文件夹下YER文件夹中,并改名为TULE.C。
[A]claiming[B]crimes[C]faster[D]giving[E]growing[F]host[G]lawless[H]people[I]police[J]rarely[K]slow
最新回复
(
0
)