下列不属于生态系统的是_刷题宝

题干

下列不属于生态系统的是（）

A：一条河中所有的鱼

B：一块草地

C：一片湿地

D：一个校园

上一题下一题 0.0难度选择题更新时间:2013-10-26 03:40:56

答案(点此获取答案解析）

A

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