[audioFiles]2018m6s/audio_ezfj_021_180602[/audioFiles]Sport Balloons There

游客2023-10-28 58

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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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[audioFiles]2018m6s/audio_ezfj_021_180602[/audioFiles]Sport Balloons There

[audioFiles]2017m6x/audio_ezfm_009_201706[/audioFiles]

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A.乳果糖 B.L-鸟氨酸-L-门冬氨酸 C.新霉素 D.谷氨酸 E.氟

A.95%乙醇B.90%乙醇C.70%～90%乙醇D.50%～70%乙醇E.50

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