填空题

12.Man has always wanted to fly. Even as long as eight hundred years ago, an Englishman had tried. He made a pair of _（_    )__ from chicken feathers and fixed them to his shoulders. Then he jumped from a tall building. As you can imagine, he did not fly very far. __（  _)_, the fell to the ground and broke several bones. The first real attempt at flying took place in France in 1783. The two Mongolian brothers knew that hot air rose. If they could fill a large balloon with hot air, they thought it would rise into the air and __（  )__. They were right. They made a very large hot air balloon of cloth and paper. It measured ten meters in diameter. They filled it with hot air and the balloon got two hundred meters into the air. It fell to earth about three kilometers _（  )__.

At the next attempt, they arranged for a balloon to carry passengers. We do not know what the passengers felt about the trip as they were a cock, a duck, and a sheep. But we _（  )__ know that the trip lasted eight minutes and the animals landed safely. 

人类总想飞行。 甚至早在800年前， 就有一个英国人尝试过。他用鸡的羽毛做了一双翅膀， 把翅膀固定在肩膀上。 然后从一个很高的建筑物上跳下去。你能想象的到， 他没有飞多远。 相反， 他掉到了地上，摔断了几根骨头。 第一次真正意义上的试飞发生在1783年， 在法国。2个蒙古的兄弟了解到热的空气可以上升。如果他们能把一个大的气球装满热气，他们认为热气球就会飞到空中。他们是正确的， 他们用一些布料和纸做了一个很大的热气球， 直径有10米。他们把气球充满热气，气球就飞到了空中200 米的高度。在300米以外的地方着陆。

第二次试验的时候，他们装载了乘客。因为乘客是一只公鸡、一只鸭子和一只绵羊，所以我们不知道他们对于那次飞行有什么感受。 但是，我们知道的是那次旅游持续了8分钟并且动物都安全的着陆了。