Which of the following is true according to the text? In the US; there is a long waiting list for orgasm because ______.

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问题 Which of the following is true according to the text?
In the US; there is a long waiting list for orgasm because ______.

选项 A、there is a shortage of actual organs
B、only a few people become organ donors
C、doctors have set a limit to the number of organ recipients
D、transplant surgery is still experimental

答案B

解析 细节题。答案信息对应于第二段最后一句:The problem is that fewer than 20 percent become donors,即器官不足的原因是只有20%的死者成为器官捐赠者,与[B]一致。
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