3、The ups and downs of life may seem to have no predictable plan. But scientists now know there are very definite life patterns that almost all people 76 ____ . Today，when we live 20 years longer than our great-grandparents，and when women mysteriously 77 ____ men by seven years，it is clearer than ever that the“game of life”is really a game of 78 ____ . As we age, we trade strength for ingenuity，speed for thoroughness，passion for reason. These 79 ____ may not always seem fair，but at every age，there are some 80 ____ . So it is reassuring to note that 81 ____ you've passed some of your“prime.”you still have other prime years to experience 82 ____ . Certain important primes seem to 83 ____ later in life. Then which are the best years of life? When asked this question, people may 84 ____ with various answers. It seems that different periods of life 85 ____ to different kinds of achievement.

83.____

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