D
Grown-ups are often surprised by how well they remember something they learned as children but have never practiced still swim as well as ever ever since．A man when he gets back who has not had a chance to go swimming for years can in the water．He can get on a bicycle after many years and still ride away．He can play catch and hit a ball as well as his son．A mother who has not thought about the words for years can teach her daughter the poem that begins "Twinkle, twinkle, little star"。remember the story of Cinderella or Goldilocks and the Three Bears．
One explanation is the law ofoverlearninrf , which can be stated as follows: Once we have learned something, additional learning trials（尝试）increase the length of time we will remember it．
In childhood we usually continue to practice such skills as swimming, bicycle riding, and playing baseball long after we have learned them．We continue to listen to and remind ourselves of words such as "Twinkle, twinkle, little star" and childhood tales such as Cinderella and Goldilocks．We not only learn but overlearn．
The multiplication tables（乘法口诀表）are an exception to the eeneral rule that we forget rather quickly the things that we learn in school, because they are another of the things we overlearn in childhood．
The law of over learning explains why cramming（突击学习）for an examination．though it may result in a passing grade, is not a satisfactory way to learn a college course．By cramming, a student may learn the subject well enough to get by on the examination, but he is likely soon to forget almost everything he learned．A little overlearning．on the other hand, is really necessary for one's future development．
【題組】68．The author explains the law of overleaming by_________．
(A)presenting research findings
(B)setting down general rules
(C)making a comparison
(D)using examples
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