单项选择题


A．selections
B．collections
C．sources
D．origins
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单项选择题
According to the passage, which of the following was an obstacle to the development of the icebox
A．Competition among the owners of refrigerated freight cars.
B．The lack of a network for the distribution of ice.
C．The use of insufficient insulation.
D．Inadequate understanding of physics.
单项选择题
What does the passage mainly discuss
A．The influence of ice on the diet.
B．The development of refrigeration.
C．The transportation of goods to market.
D．Sources of ice in the nineteenth century.
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