摘要：31． (1)D··········································································································· 2分 (2)水·········································································································· 2分 (3)B············································································································ 2分 载畜量······················································ 2分 (4)对人类有益···························································································· 2分 (5)B2和C2·································································································· 2分 分解者不能在短时间内将聚乙烯降解成无机物········································ 2分 (6)呼吸作用所消耗····················································································· 2分 光合作用产生的O2与呼吸消耗的O2······················································· 2分

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