The rise and fall of the tide is caused by the gravitational pull of the___________.

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The rise and fall of the tide is caused by the gravitational pull of the___________.
The rise and fall of the tide is caused by the gravitational pull of the___________.

The rise and fall of the tide is caused by the gravitational pull of the___________.
应该moon
潮水的涨落是由月心引力引起的.