单项选择题

Which of the following titles would best describe the content of the text

A．Several Theories of Ocean Basin Formation.
B．Temperature Differences Among the Oceans.
C．The Traditional View of the Oceans.
D．Motions and Ocean Currents.
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单项选择题
Which of the following does the author seem to prefer
A．That the earth behaves as a liquid result in many great oceans.
B．The temperature of the sinking plate is lower than its surrounding.
C．The traditional view of the origin of the ocean basin is thoroughly wrong.
D．Neither the African nor the American plate moves according to the alternative theory.
单项选择题
According to the traditional view of the origin of the ocean basins, which of the following is sufficient to move the continental plates
A．Spreading of ocean trenches.
B．Movements of min-ocean ridges.
C．Sinking of ocean basins.
D．Differences in temperature under oceans and continents.
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