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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单项选择题
Which of the following, if it could be demonstrated, would most support the traditional view of ocean basin formation
A．The upper mantle of the earth behaves as a dense solid.
B．Movements usually occur along lines.
C．Sinking plates cool the surface of the earth.
D．The rising motion currents keep exact pace with them.
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.
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