下列有关生物量的说法正确的是(　　)-湖北继续教育网网校

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[单选题]下列有关生物量的说法正确的是(　　)

A陆地生态系统中最大的是热带雨林

B冻土带的生物量最低

C在水生生态系统中，水的最表层的生物量最大

D森林生态系统中，树冠的最顶部生物量最大

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