右图表示某草地上草虫鸟三类生物数量的变化曲线下列叙述正确的是 A.甲乙丙依次是鸟虫草 b.a点时丙数量的上升主要是食物的增加 Template




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tomski右图表示某草地上草虫鸟三类生物数量的变化曲线下列叙述正确的是 a.甲乙丙依次是鸟虫草 b.a点时丙数量的上升主要是食物的增加 coloring