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
The main cause of the great loss of property 'after the San Francisco earthquake in 1960 is______.
A．falling buildings
B．broken pipes
C．fires
D．floods
单项选择题
In paragraph 7, the author mentions road accidents in order to tell people ______.
A．Americans are not afraid of traffic accidents
B．Americans take road accidents for granted because they do not observe traffic rules
C．speeding is the major cause of road accidents in America
D．road accidents actually kill more people than earthquake but are neglected in America
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