单项选择题

Questions 23 to 25 are based on the passage you have just heard.
How much percent of the earth does the sea cover

A．Seventy-one percent.
B．Thirty percent.
C．Thirty-nine percent.
D．Twenty-nine percent.

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单项选择题

单项选择题

Questions 23 to 25 are based on the passage you have just heard. How much percent of the earth does the sea cover 您的浏览器不支持 audio 元素。