環境保護 デイリーステッカー 4.17 参加賞 5問正解で追加賞
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単一選択問題：酸性雨とは、pH値が（ ）の大気中の湿性沈着物のことで、雨、雪、霧、露などを含む。A、＞5.6 ; B、＞7 ; C、＜5.6; D、＜7 ; C
酸性雨とは、pH値が5.6未満の大気中の湿性沈着物で、雨、雪、霧、露などを含みます。
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