※ 내용의 흐름상 적절하지 못한 문장을 고르시오. [문 19～문 20] Most of us who have ever cleaned a house would be much happier if there were less dust.

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2. This could decrease the amount of carbon dioxide in the atmosphere, alleviating the threat of global warming.Thus, water vapor could be much less likely to turn to rain without the dust particles.

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However, without dust there would be less rainfall and sunsets would be less beautiful. Rain is formed when water molecules in the air collect around particles of dust. When the collected water becomes heavy enough, the water droplets fall to the earth as rain.

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This could decrease the amount of carbon dioxide in the atmosphere, alleviating the threat of global warming.Thus, water vapor could be much less likely to turn to rain without the dust particles.

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The water vapor and dust particles also reflect the rays of the sun. At sunrise and sunset, when the sun is below the horizon, the dust and water vapor molecules reflect the longer, red wavelengths of light such that we can see them for more time than any of the other wavelengths.

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The more dust particles in the air, the more colorful the sunrise or sunset.