单项选择题

According to the information in the second paragraph, an ideal icebox would______.

A．completely prevent ice from melting
B．stop air from circulating
C．allow ice to melt slowly
D．use blankets to conserve ice
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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
According to the writer, ______portrayed in books may become our companions and friends.
A．all characters, real and imaginary
B．only real characters
C．only imaginary characters
D．none of the characters
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