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第38课: 水和旅行者 Water and the traveller | 新概念英语4
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# Read and answer this question: What does this text describe?
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Contamination of water supplies is usually due to poor sanitation close to water sources, sewage disposal into the sources themselves, leakage of sewage into distribution systems or contamination with industrial or farm waste. Even if a piped water supply is safe at its source, it is not always safe by the time it reaches the tap. Intermittent tap-water supplies should be regarded as particularly suspect.
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第38课: 水和旅行者 Water and the traveller
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