单项选择题

The author implies that in the 1920s and 1930s home deliveries of ice ______.

A．decreased in number
B．were on an irregular schedule
C．increased in cost
D．occurred only in the summer
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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.
单项选择题
What does the passage mainly discuss
A．Causes of food spoilage.
B．Commercial production of ice.
C．Inventions that led to changes in the American diet.
D．Population movements in the nineteenth century.
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