options: m : you 're welcome . i enjoyed talking about the changes of animals ' life with you . m : you 're welcome . i enjoyed talking about the changes of life with you . m : you 're welcome . i enjoyed talking about the history of planes . m : you 're welcome . i enjoyed talking about the invention of electric lights .
article: f : how is travel in the 1960s different from that of the early 1900s dad ? m : well in the 1960s people rode in cars over wide roads . they flew in planes from europe to america in a few hours . f : what about the 1900s ? m : in the early 1900s planes were very new , to see one was so unusual that people of a town stopped what they were doing to watch it flying overhead . f : but today , it is quite different is n't it ? m : yes , today you were able to travel to many places in a few hours because of the development of the plane . you turn on electric lights because someone invented ways to make use of electricity , you are part of history . f : is our life also changed by history ? m : that 's right . the history made by people before you were born has changed your life . f : i see thank you dad .