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
It can be inferred that railroad refrigerator cars came into use ______.
A．before 1860
B．before 1890
C．after 1900
D．after 1920
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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