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For thousand of years men couldn’t fly. It was 1. ______
For thousand of years men couldn’t fly. It was 1. ______
游客
2025-07-24
17
管理
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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答案
a→an
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