[单项选择] The ups and downs of life may seem to have no predictable plan. But scientists now know there are very definite patterns that almost all people share. Even if you’’ve passed some of your "prime", you still have other prime years to experience in the future. When are you smartest From 18 to 25, according to I. Q. scores; but you’’re wiser and more experienced with increasing age. You’’re sharpest in your 20’’s. But your I. Q. for other tasks climbs. Your vocabulary at age 45, for example, is three times as great as when you graduated from college. At 60, your brain possesses almost four times as much information as it did at age 21. When are you happiest You have the best physical sense of yourself from 15 to 24; the best professional sense from 40 to 44. Before age 24, we believe that our happiest years are yet to come; over 30, we believe that they’’re behind us. A National Health Survey agrees: After age 30, we become more realistic and do not view happines
A. From about 15 to 25.
B. Over 30.
C. From 45 to 49.
D. At 60.

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