Thanks to the introduction of new drugs, many of the early problems in organ transplants, such as tissue rejection, have, to a g

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问题 Thanks to the introduction of new drugs, many of the early problems in organ transplants, such as tissue rejection, have, to a great extent, now been solved. However, there remains a major problem. The people in need of transplant surgery far outnumber the available organs.
   Many countries, such as Britain, have huge waiting lists of people whose lives could be saved by being given a kidney, lung, heart, or liver transplant. Sadly, many of them die before they reach the top of those lists.
   Under the present British policy, people are asked to carry donor (捐赠人) cards, and/or put their names on the national donor register. Thus, if they lose their lives suddenly, for example, in a traffic accident, they have given permission in advance of their deaths for their organs to be used. If they have not done so, surgeons are faced with the task of asking the grieved relatives for permission to use the organs of the dead. Of course, often the relatives are too upset even to think of such a thing until it is too late. Organ transplants have to take place quite soon after the death of the donor.
   Dying and donating organs is not something most of us like to think about, and only about 14% of people have registered. Now it has been suggested that, instead of the present register, there should be a register of potential donors who haven’t made up their minds.
Nowadays a major problem in transplant surgery is______.

选项 A、the shortage of qualified doctors
B、the lack of transplant organs
C、tissue rejection
D、immature techniques

答案B

解析 细节题。第一段最后一句告诉我们:现在需要器官移植的人数远远超过(outnumber)可移植器官的数量,这是主要问题。故选B。
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