单词：oligosilicic acid
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What's been called the scariest place on earth is the sight of our next story. Despite it's name, the Demilitarized Zone, the border that separates North Korea and South Korea is one of the most heavily militarized borders on the planet. But in one s
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That's the sound of clean coal. Well, cleaner coal. A relatively small unit attached to the smokestack at the Mountaineer Power Plant in West Virginia is capturing some 1.5 percent of the carbon dioxide the coal-fired plant would otherwise belch into
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Lesson Two 听力部分 Dictation: Please prepare your paper and pen. _____ to recall to the ____. ____________ after absorbing _______________, _______ the key ________ of the ________ in your ____. Don't _____ if ___'__ _________ some of it. Do ___
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