参考答案：A

解析：近义辨析。protect…from保护：protect the plants from the cold保护植物使不受冻。relieve…of免除，解除：Let me relieve you of that heavy parcel．让我把你的重包裹解下来吧。preserve保护，防护，维护：The Town Council spent a lot of money to preserve the old castle and other places of historic interest．市政委员会花了不少钱来维修那座古城堡和其它古迹。conserve使(某事物)不受损失或不受损害，保藏，保存：People have to learn to conserve water anytime，especially during the drought．大家必须学会节约用水，特别是在干旱期间。