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A. immeasurably B. replaced C. priority D. failing  E. frustratingly
F. potential  G. minor  H. trick  I. unrepaired J. prospect K. wiring

Scientific breakthroughs mean that life expectancy continues to rise every year. But the medical advances which now make it possible to think about living to a very great age --- if not forever --- also raise profound practical and ethical issues.   
Is immortality (永生) a realistic __41__? 

 Not for the foreseeable future. In last year’s Reith lectures, the gerontologist (老年病學家) Professor Tom Kirkwood firmly quashed (打消) the idea that genetic engineering might result in some kind of “fountain of youth”. Considering how __42__slow the battles against cancer, heart disease and strokes have been, he said, it is fanciful to imagine that we could conquer death. On the other hand, scientists do now understand more about why we age, and what can be done to slow down the process. “Our ancestral genes placed limited __43__on long-term maintenance and repair,” says Kirkwood. “Ageing comes about through the gradual build-up of __44__ faults in the cells and tissues of our bodies, not as the result of some active mechanism for death and destruction.” The __45__ , then, is to help the body repair the damage done by wear and tear.
How can that be done? 

 In many different ways, some of which are already pretty common. Organ transplants from pigs and monkeys are now old news --- the American politician Jesse Helms has just had a ten-year-old pig valve (瓣膜) in his heart __46__. Doctors have succeeded in __47__computerized implants directly to nerve fibres, allowing the deaf to hear, and there is hope that electrodes (電極) planted in the brain may soon offer hope for the blind to see. But the real __48__at the moment lies in the field of stem cells --- special cells that allow lizards (蜥蜴) to grow new tails and humans to grow new skin over __49__cuts. If scientists can learn how to control these cells, they could be used to reproduce parts of the body that are __50__.  

真相大白

41.J        42. E       43.C       44.I         45.H                        

46. B       47.K       48.F       49.G         50.D

名師把脈

步步為贏

41. prospect。解析：realistic為形容詞，缺名詞，prospect意為前景。該句意思是未來永生可以成為現實嗎？

42. frustratingly。解析：how后面缺程度副詞修飾形容詞slow，對抗各類疾病的斗爭緩慢，這是令人沮喪的事情。

43. priority。解析：形容詞limited后缺名詞，另外，注意“優先考慮”的表達——place/priority on/ upon sth.，平時要注意表達的積累。

44. unrepaired。解析：選擇形容詞修飾fault，出現老化是因為細胞和組織中未修復的“毛病”。

45. trick。解析：trick有計策的含義。Damage對應前句提到的fault，為同義轉換。針對上述身體上的毛病，then引出解決方法就是修復這些問題。

46. replaced。解析：注意使役態have sth. done，由別人來做某事，這里是將人的心臟瓣膜和豬的替換，replace有替換的意思。

47. wiring。解析：首先succeed in doing sth.，這里選唯一一個v-ing無可厚非。從含義上來看，這個手術是將計算機植入體與神經纖維連線。

48. potential。解析：but有前后轉折的邏輯，前面兩個例子是通過植入物造福病人，給人帶來希望，后一句話鋒一轉，指出真正的潛力蘊藏在自身的干細胞中。

49. minor 。解析：選擇形容詞修飾割傷cuts，干細胞讓人類在輕微皮膚割傷后可以長出新的皮膚，運用常識也知道，大的傷害就要借助醫療的力量了。

50. failing。解析：與reproduce（重生）相對應，這里修飾定從先行詞body是那些已損傷的機體，對failing的理解要到位，不是表面含義的失敗，而是功能缺失或有毛病的。