单项选择题

Which of the following is practical but only makes a marginal contribution to solving the problem of greenhouse emissions

A．The use of fuels other than gasoline.
B．Improved energy efficiency.
C．The introduction of less polluting driving systems.
D．Reducing car use by carpoolin
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单项选择题
Which statement best describes the main idea of the passage
A．It discusses the advantages and disadvantages of freezers.
B．It tells the most economical ways to use a freezer.
C．It explains how to defrost a manual-defrost freezer.
D．It offers advice about choosing and caring for a freezer.
单项选择题
According to the passage, choosing the best place for your freezer means ______.
A．putting it in an unheated garage if possible
B．trying to keep it away from heat, drafts, and humidity
C．locating it near a sink if it is a manual-defrost model
D．locating it as close as possible to the kitchen door
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