小实验
<p>有一天，科学老师说：“回家把小苏打和白醋混到一块，再点燃一根火柴放在水面上方会出现什么结果。”</p><p><span word="One">One</span> <span word="day">day</span>, <span word="the">the</span> <span word="science">science</span> <span word="teacher">teacher</span> <span word="said">said</span>, "<span word="what">what</span> <span word="happens">happens</span> <span word="when">when</span> <span word="you">you</span> <span word="go">go</span> <span word="home">home</span> <span word="and">and</span> <span word="mix">mix</span> <span word="bicarbonate">bicarbonate</span> <span word="with">with</span> <span word="white">white</span> <span word="vinegar">vinegar</span>, <span word="and">and</span> <span word="then">then</span> <span word="light">light</span> <span word="a">a</span> <span word="match">match</span> <span word="on">on</span> <span word="top">top</span> <span word="of">of</span> <span word="the">the</span> <span word="water">water</span>."</p><p>放学后，我就买了小苏打和白醋、火柴。回到家，我就拿来小碗，先倒进白醋，再把小苏打粉倒进白醋里，小苏打粉一接触到白醋，小碗水面上就冒起了雪白的泡泡，像倒出来的雪碧一样，同时我闻到有一种刺鼻的味道。我点燃火柴，放到小苏打和白醋混合的液体上方一厘米处，火一下就灭了。</p><p><span word="After">After</span> <span word="school">school</span>, <span word="I">I</span> <span word="bought">bought</span> <span word="baking">baking</span> <span word="soda">soda</span>, <span word="white">white</span> <span word="vinegar">vinegar</span> <span word="and">and</span> <span word="matches">matches</span>. <span word="When">When</span> <span word="I">I</span> <span word="get">get</span> <span word="home">home</span>, <span word="I">I</span> <span word="will">will</span> <span word="take">take</span> <span word="a">a</span> <span word="small">small</span> <span word="bowl">bowl</span>, <span word="pour">pour</span> <span word="it">it</span> <span word="into">into</span> <span word="white">white</span> <span word="vinegar">vinegar</span> <span word="first">first</span>, <span word="and">and</span> <span word="then">then</span> <span word="put">put</span> <span word="baking">baking</span> <span word="soda">soda</span> <span word="into">into</span> <span word="white">white</span> <span word="vinegar">vinegar</span>. <span word="As">As</span> <span word="soon">soon</span> <span word="as">as</span> <span word="baking">baking</span> <span word="soda">soda</span> <span word="touches">touches</span> <span word="white">white</span> <span word="vinegar">vinegar</span>, <span word="there">there</span> <span word="will">will</span> <span word="be">be</span> <span word="white">white</span> <span word="bubbles">bubbles</span> <span word="on">on</span> <span word="the">the</span> <span word="water">water</span> <span word="surface">surface</span> <span word="of">of</span> <span word="the">the</span> <span word="small">small</span> <span word="bowl">bowl</span>, <span word="like">like</span> <span word="the">the</span> <span word="poured">poured</span> <span word="sprite">sprite</span>. <span word="At">At</span> <span word="the">the</span> <span word="same">same</span> <span word="time">time</span>, <span word="I">I</span> <span word="smell">smell</span> <span word="a">a</span> <span word="pungent">pungent</span> <span word="smell">smell</span>. <span word="I">I</span> <span word="lit">lit</span> <span word="the">the</span> <span word="match">match</span>, <span word="put">put</span> <span word="it">it</span> <span word="a">a</span> <span word="centimeter">centimeter</span> <span word="above">above</span> <span word="the">the</span> <span word="mixture">mixture</span> <span word="of">of</span> <span word="baking">baking</span> <span word="soda">soda</span> <span word="and">and</span> <span word="white">white</span> <span word="vinegar">vinegar</span>, <span word="and">and</span> <span word="the">the</span> <span word="fire">fire</span> <span word="went">went</span> <span word="out">out</span> <span word="in">in</span> <span word="a">a</span> <span word="flash">flash</span>.</p><p>我又把水到掉，只放了小苏打，又点燃一根火柴放到上方，但是火没有灭。我又把小苏打到掉，只放了白醋，又点燃一根火柴放到上方，火还是没有灭。现在我知道了，小苏打和白醋混到一块的气体把火灭掉的。</p>
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