54．A 　细节理解题。根据最后一段可知，作者意识到要想过有意义的生活得自己亲自去经历。故A正确。

　　In the Caucasus region of the Soviet Union, nearly 50 out of every 100,000 people live to celebrate their 100th birthday, and many don’t stop at 100! By comparison, in America only 3 people in 100,000 reach 100. But these Soviet old people aren’t alone. The Pakistani Hunzas, who live high in the Himalaya Mountains, and the Vilacbambans of the Andes Mountains in Ecuador seem to share the secret of long too.

　　These peoples remain healthy in body and spirit despite the passage of time. While many older persons in industrial societies become weak and ill in their 60s and 70s, some Soviet Georgians, aged 110 to 140, work in the fields beside their great- great- grandchildren. Even the idea of aging is foreign to them. When asked, “At what age does youth end?”, most of these old people has no answer. Several replied, “Well, perhaps at age 80.” The very youngest estimate was age 60.

　　What accounts for this ability to survive to such old age, and to survive so well? First of all, hard physical work is a way of life for all of these long-lived peoples. They begin their long days of physical labor as children and never seem to stop. For example, Mr. Rustam Mamedov is 142 years of age. He remember his life experiences: the Grimean War of 1854; the Turkish War of 1878; the Bolshevik Revolution in 1917. His wife is 116 years old. They have been married for 90 years. Mr. Mamedov has no intentions of retiring from his life as a farmer. “Why? What else would I do?” he asks. Oh, he has slowed down a bit. Now he might quit for the day after 6 hours in the field instead of 10.

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