吉林大学远程教育学院  
    >>>>   Unit One
    >>>>   Unit Two
    >>>>   Unit Three
    >>>>   Unit Four
    >>>>   Unit Five
    >>>>   Unit Six
    >>>>   Unit Seven
    >>>>   Unit Eight
    >>>>   Unit Nine
    >>>>   Unit Ten
    >>>>   Unit Eleven
    >>>>   Unit Twelve
    >>>>   Unit Thirteen
    >>>>   Unit Fourteen
    >>>>   Unit Fifteen
    >>>>   Unit Sixteen
    >>>>   Unit Seventeen
    >>>>   Unit Eighteen
    >>>>   Unit Nineteen
    >>>>   Unit Twenty
    >>>>   Unit Twenty-one
    >>>>   Unit Twenty-two
    >>>>   Unit Twenty-three
    >>>>   Unit Twenty-four
    >>>>   Unit Twenty-five
    >>>>   Unit Twenty-six
    >>>>   Unit Twenty-seven
    >>>>   Unit Twenty-eight
    >>>>   Unit Twenty-nine
    >>>>   Unit Thirty
Background Information |  Synopsis |  Warm-up activity |  Text | 


Passing Trains




The local doctor whom Mr. Johnson consulted concerning his health was also an amateur mathematician and a collector of puzzles.

約翰逊先生咨询的那位本地医生,同时也是位业余数学家,他爱好收集古怪的问题.


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