单项选择题

Which of the following is the best solution to the problems mentioned in the passage

A．The designing of highly efficient car engines.
B．A reduction of vehicle use in cities.
C．The development of electric cars.
D．The use of less polluting fuels.

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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

单项选择题

The underlined word manual in the third paragraph means ______.

A．man-made
B．automatic
C．using hands
D．everlasting