填空题
What is the percentage of people who send cards to themselves on February 14？
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填空题
Why do some people send cards to themselves on February 14?
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填空题
How did the 1/10 of the persons get the cards on that day?
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填空题
Which nation is the least romantic according to the passage?
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填空题
What is the best gift for the French on February 14?
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