单项选择题

During the 1860s canned food products were ______.

A．unavailable in rural areas.
B．shipped in refrigerator cars.
C．available in limited quantities.
D．a staple part of the American diet.
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单项选择题
Which of the following statements is supplied by the passage
A．Tin cans and iceboxes helped to make many foods more widely available.
B．Commercial ice factories were developed by railroad owners.
C．Most farmers in the United States raised only fruits and vegetables.
D．People who lived in cities demanded home delivery of foods.
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