题目内容
Read the passage and fill in the blanks with the proper words.
Balloons have been used for sport for about one hundred years. There are two k_______ of sport balloons, gas and hot air. Hot air balloons are s_________ than gas balloons, for they may catch fire. Hot air balloons are p________ by most balloonists in the United States because of its s________. They are also cheaper, and e_________ to manage than gas balloons.
答案:kinds;softer;preferred;safety;easier
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