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小学科学知识趣味学6：三种保护自然资源的好办法
这个夏天真是太热了，像一个大火炉，花园里的花朵都垂下了头。安安和小伙伴们决定，从大水缸里接一点水来浇花。可是大水缸里的水都不见了！
小学科学知识趣味学6/81
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