7．[1]Adults are often astonished by how well they remember something they learned as children but have never practiced ever since．A man who has not had a chance to go swimming for years can still swim as well as ever when he gets back 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"or remember the story of Cinderella or Goldilocks and the Three Bears．
[2]One explanation is the law of overlearning，which can be stated as follows：Once we have learned something，additional learning trials increase the length of time we will remember it．
[3]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．
[4]The multiplication tables（乘法口訣表）are an exception to the general rule that we forget rather quickly the things that we learn in school，because they are another of the things we overlearn in childhood．
[5]The law of overlearning explains why cramming（突擊學(xué)習(xí)）for an examination，though it mayresult in/lead to/contribute to/bring/bring about 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．
161．What is the main idea of Paragraph 1？（no more than 10words）
People remember well what they learned in childhood
162．What is the law of overlearning？（no more than 18words）
Once we have learned something，additional learning trials increase the length of time we will remember it．
163．How does the author explain the law of overlearning？（no more than 5words）
By using/giving examples
164．What does the underlined word"they"in Paragraph 4refer to？（no more than 3words）
The multiplication tables．
165．Fill in the blank in Paragraph 5with proper words．（no more than 3words）
result in/lead to/contribute to/bring/bring about．
