A、<span style=";font-family:宋体;font-size:16px">生态平衡</span>
B、<span style=";font-family:宋体;font-size:16px">生</span><span style=";font-family:宋体;font-size:16px">态</span><span style=";font-family:宋体;font-size:16px">环境</span>
C、<span style=";font-family:宋体;font-size:16px">自然环境</span>
D、<span style=";font-family:宋体;font-size:16px">生</span><span style=";font-family:宋体;font-size:16px">存</span><span style=";font-family:宋体;font-size:16px">环境</span>
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