题目内容：
地球上可利用的淡水不到总水量的1%，我们应爱护水资源。下列有关水的说法正确的是
A.海水都是混合物，淡水都是纯净物
B.通过水的电解实验可以得到“水是由氢气和氧气组成”的结论
C.爱护水资源主要应从节约用水和防治水体污染两方面采取措施
D.硬水是含有可溶性钙、镁化合物的水，软水是不含可溶性钙、镁化合物的水
参考答案：
选择题：地球上可利用的淡水不到总水量的1%，我们应爱护水资源。下列有关水的说法正确的是
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