问题标题：
Oceancoveraboutthree-quartersoftheearth'ssurface.（对'three-quarters"提问）________oftheearth'ssurface____oceans____.
问题描述：
Oceancoveraboutthree-quartersoftheearth'ssurface.（对'three-quarters"提问）
________oftheearth'ssurface____oceans____.
康冬冬回答：
Howmuchoftheearth‘ssurfacedooceanscover?
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