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
The word rudimentary (Line 3, Para. 2) is closest in meaning to______.
A．growing
B．undeveloped
C．necessary
D．uninteresting
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