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现在我国对三江平原已经停止垦荒，主要原因是（　　）

A、保护湿地生态系统

B、土地日渐贫瘠,产出降低

C、我国粮食产量已经过剩

D、准备开发石油资源,建立石油基地

时间：2021-07-17 20:33 关键词：学历教育成人高考 2012年成人高考高起点《历史地理》模拟预测卷(1)

答案解析

A

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