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E
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D
单项选择题
A．To find out whether there is life in the deep water.B．To help better understand the water area of the earth.C．To learn more about the marine life.D．To find out how many sea animals there are in the sea.
A．To find out whether there is life in the deep water.
B．To help better understand the water area of the earth.
C．To learn more about the marine life.
D．To find out how many sea animals there are in the sea.
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