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单项选择题

It can be inferred that railroad refrigerator cars came into use ______.

A．before 1860
B．before 1890
C．after 1900
D．after 1920

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热门试题

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

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.