At first they made wings like birds. Then they jumped off high buildings in order to fly. Many men did this but they all failed. After many failures (失败) they stopped trying to fly with wings. Then two brothers tried another way. They tried balloons (气球). “Hot air is lighter than cold air,” they said, “That is why hot air goes upwards. If we fill a balloon with hot air, it will go upwards.

　　After many experiments, they made two men go up in a balloon full of hot air. A great crowd of people watched. The balloon rose to a height (高度) of 900 metres. The wind blew it along for nine kilometres. Then it came gently back to earth. For the first time man travelled through the air!

　　60. Hundreds of years ago men realized that ______

　　A.birds fly easily because there is air

　　B.birds fly easily because they are small

　　C.birds fly easily because they have wings

　　D.birds fly easily because they are light

　　61. When some men tried to fly with wings, ______

　　A.only a few of them succeeded

　　B.only the two brothers succeeded

　　C.many of them succeeded

　　D.none of them succeeded

　　62. Balloons seemed not a good way to travel because ______

　　A. they went too high B. they went too low

　　C. they were too big D. they were not easy to operate

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