填空题

Potters for Peace has designed a low-cost system to purify dirty water, but it has not won governmental support.

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People may get seriously sick after drinking dirty water because of the harmful organisms it contains.
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A Letter to a Schoolmate1. 对同学的处境表示理解，因为自己也有过类似经历。2. 谈谈自己是如何克服消沉的情绪并积极看待这资挫折的。3. 结合自身经历对同学提出建议，给予鼓励。
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