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专四听写训练111:Balloons

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Balloons have been used for sport for about 100 years. There are two kinds of sport balloons, gas and hot-air. Hot-air balloons are safer than gas balloons, which may catch fire. Hot-air balloons are preferred by most balloonists in the United States because of their safty. They are also cheaper and easier to manage than gas balloons. Despite the ease of operating a balloon, pilots must watch the weather carefully. Sport balloon flights are best early in the morning or late in the afternoon when the wind is late. Over the years, balloonists have tried unsuccessfully to cross the Atlantic. It wasn't untill 1978 that three American balloonists succeeded.It took them just 6 days to make the trip, from their homes in the United States to Paris, France. Their voyage captured the imagination of the whole world.

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2012-01-06 10:01 编辑:wjy2005tom
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