单选题 Scientists now believe that artificial-hip implants, previously thought to be safe, may actually increase the risk of cancer in recipients after about 45 years of use. Though these implants do improve the quality of recipients" lives, the increased risk of cancer is an unacceptable price to pay for these improvements. Therefore, they should be banned.
Which of the following, if true, is the strongest counterargument to the argument above?

A、 Artificial-hip implant surgery can cause severe complications, such as infection, chronic fever, and bone degeneration, and these complications can themselves be crippling or even fatal
B、 Almost all artificial-hip implant recipients receive their implants at an age when they are unlikely to live more than an additional 30 years
C、 Although artificial-hip implants increase the risk of cancer after about 45 years of use, a few of the cancers they induce are not fatal
D、 Since artificial-hip implants are not very common, banning them would cause little hardship
E、 Although the benefits of artificial-hip implant surgery have remained substantially the same over the past decade, the price of the surgery has risen considerably

【正确答案】 B

【答案解析】[解析] 本题推理为：“因为该手术会提高接受者在使用45年之后得癌症的危险，所以该手术应被禁止”。反对可以反对原因。若几乎所有做该手术的人在接受手术时不大可能再活30年，如(B)所说，那么就使得接受者在45年之后得癌症的危险变得无意义，因此(B)正确。(A)是一个支持选项。(C)、(D)、(E)均与推理无直接关系。