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What percentage of water on the earth can be directly used by us？（　　）
This may seem strange to you because nearly 75% of the earth's surface is covered with water.But about 97% of this water is sea water.We can only drink and use the other 3% of the fresh water that comes from rivers，lakes，and other sources.And we cannot even use all of that directly，because some of it is in the form of icebergs and glaciers.

【考點(diǎn)】介紹．
【答案】D
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發(fā)布：2024/11/9 10:0:1組卷：0引用：2難度：0.8
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