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A02 * 2015(7월)/교육청 24 다음 글의 밑줄 친 부분 중, 어법상 틀린 것은? [2점] Not many years ago, schoolchildren were taught that carbon dioxide is the ① naturally occurring lifeblood of plants, just as oxygen is ours. Today, children are more likely to think of carbon dioxide as a poison. That's because the amount of carbon dioxide in the atmosphere ② has increased substantially over the past one hundred years, from about 280 parts per million to 380. But what people don't know is that the carbon dioxide level some 80 million years ago—back when our mammalian ancestors were evolving—③ to be at least 1,000 parts per million. In fact, that is the concentration of carbon dioxide you regularly breathe if you work in a new energy-efficient office building, for ④ that is the level established by the engineering group that sets standards for heating and ventilation systems. So not only ⑤ is carbon dioxide plainly not poisonous, but change □□□□□ □□□□□ trigger for global warming historically.
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