All food is______.
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A.where
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现代生态学的研究对象是 ()
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______ a little more tolerant our world would be a better place.
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年龄结构为增长型的种群,其年龄锥体的形状为中间宽上下窄。()
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生态系统中的有机物质逐步降解的过程即为分解作用。()
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It was not until he arrived at the station______he realized he had forgotten his ticket.
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The babies would "smile and bubble" at the lights because ______.
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次生演替的结果是群落复生。()
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马克思主义哲学产生的最主要的自然科学基础是()
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