Oceans cover about three quarters of the earth's surface,改为一般疑问句

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Oceans cover about three quarters of the earth's surface,改为一般疑问句

Do Oceans cover about three quarters of the earth's surface?

Do oceans cover about three quarters of the earth's surface ?
一般现在时。原句的谓语动词cover没加s,就说明oceans 是复数了