单项选择题

According to the passage, Florida oranges were valued by the Spanish primarily ______.

A．as a medium of exchange
B．for their unusual seeds
C．for their medical use
D．as a source of food for sailors
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单项选择题
According to the passage, Spanish vessels began to bring orange tree seedling to North America when ______.
A．the United States agricultural laws were revised
B．ambitious sailors began to smuggle seeds
C．doctors reported a lack of medical supplies
D．authorities realized that seeds did not travel well
单项选择题
The Spaniards did not grow oranges commercially in the New World because ______.
A．oranges tended to dry out during shipping
B．Florida oranges were very small
C．there was no great demand for oranges in Europe
D．oranges were plentiful in their home country
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