17世纪，范·海尔蒙特将2.5kg的柳树种于100kg土中，5年中只浇水，5年后称重，柳树重82.5kg，土重约99.9㎏，由此得出绿色植物生长所需的物质主要是[]A．二氧化碳B．氧气C．水D．-七年

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