Ocean cover about three-quarters of the earth's surface.（对'three-quarters "提问）____ ____ of the earth's surface ____ oceans ____.

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• 英语句子提问1Earth-97% of its supply is salty ocean water,and not suitable for drinking,(the rest isn't very accessible either.with nearly three-quarters either frozen in polar ice caps or present as gound moisture,Less than 1% of the world 's water is in freshwater lakes and rivers)2About 4.6billion people by then -will not have adequate water .This won't just be in the third world nations ,either ,it is estimated that China's drinking water will be below
• Ocean cover about three-quarters of the earth's surface.（对'three-quarters "提问）____ ____ of the earth's surface ____ oceans ____.
• Oceans cover about three-quarters of the earth's surface. 是什么意思?
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