Sport Balloons There are two kinds of sport balloons: gas and hot air. / Hot air balloons are safer than gas balloons, / whi

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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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