[audioFiles]2016m9s/audio_ezfj_021_201609[/audioFiles]

游客2023-11-01  19

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答案                             Sport Balloons
    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 safety. /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 light.

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