人们的生产活动如围湖造田开垦草原等其结果是 A.降低了生态系统的自�调节能力b.有利于维持生态平衡c.有利于保护生态环境d.有利于人与自然 Template




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tomski人们的生产活动如围湖造田开垦草原等其结果是 a.降低了生态系统的自�调节能力b.有利于维持生态平衡c.有利于保护生态环境d.有利于人与自然 coloring