For thousand of years men couldn’t fly. It was 1. ______

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问题    For thousand of years men couldn’t fly. It was                   1. ______
too difficult. Birds are able to fly on their                   2. ______
wings. It is very easy of them to fly.                            3. ______
But men haven’t got wings. The first planes                      4. ______
were gliders — planes without engine.                            5. ______
The first plane with a engine was the Flyer.                      6. ______
Two brothers, Wilbur and Orville Wright, building                7. ______
it. In December 17th, 1903, Orville lay on the bottom wing       8. ______
of his plane and start the engine.                               9. ______
The Flyer was able take off and rose 10 feet and flew 120       10. ______
feet. This was a great moment in the history of flying. [br]

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