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환경보호 매일 한 장, 10.19 참여 보상 3, 정답 시 추가로 5 지급

2016-10-19View Original

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단일 선택 문제: 산성비의 해로운 오염물질 중 하나는 ( )입니다. A. 일산화탄소 B. 이산화규소 C. 질소산화물 D. 프레온가스. C

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