There is a lot of misunderstanding about studying . Most students have not been taught the rules behind really good working . Above is a graph showing the amount a person learns against the number of hours he works in a day . If he doesn't do any work , he learns nothing (point 0). If he does an hour's work he learns a certain amount (point 1) . If he does two hours' work he learns about twice as much (point 2) . If he does more work he'll learn still more (point 3) . Now if he tries to do 23 and  a half hours' work in 24, he'll be so tired that he'll hardly remember anything : what he learns will be very little (point 4). If he did less work , he'd learn more (point 5).

      Point x is the very maximum anyone can learn in the day . And this is the optimum . If you try to work past the optimum , you can only get tired and achieve  less than the best .

      Most students find their optimum at about five hours a day . Yours may  be a little more or a little less --- but if you get in five hours' good work a day , you will be doing well .

      When you've finished your optimum , you must stop . You must not then sit around in the chair thinking about the work --- that only tires without any learning . Your mind can't rest . You must get out and do something . It doesn't matter what ---- anything so long as you are doing , something else but work .

      72. According to the graph , "optimum" is _____ .
      A. the best amount of work to do
      B. the longest time people can work
      C. something that people should try to work past
      D. the point when people learn least

      73. Which sentence is true according to the graph ?
      A. The longer you work , the more you learn
      B. The less work you do , the more you learn
      C. If you work past the optimum , you learn more
      D. If you work past the optimum , you learn less

      74. The optimum for most students in about ____ .
      A. three hours    B. six hours    C. five hours    D. four hours

      75. What does the passage mainly discuss ?
      A. How long should you work each day ?
      B. How can you find your optimum ?
      C. How can you improve your study with additional work ?
      D. How much can you learn during the additional work ?

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