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蚯蚓生活在土壤中以土壤中腐生的植物根茎叶为食．蚯蚓在吃食物时有没有选择性�请你就这一问题设计一个实验方案进行探究．你提出的问题是 Template






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sketch 5049
sketch 2895 Hulk by Dmitry Cherepanin
sketch 5265 Shir Erika Ishikawa
sketch 4393 ant
sketch 5272
sketch 4685 Dave Mustaine by Erika Ishikawa
sketch 4190
sketch 3365 Igor by Johan Kennet Espinoza Moreno

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sketch 859 meyvalar
sketch 4900 Moonlight by Abdelwahab Haik
sketch 3538
sketch 4751 Ruko by Rodrigo Marcos
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sketch 4933 Tobi by Abdelwahab Haik
sketch 1668 SUNSET
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