单项选择题

With what topic is the passage mainly concerned（）

A．Mechanisms for safer navigation.
B．The economic structure of the marketplace.
C．A specific group of commodities.
D．The advantages of lowering taxes.

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单项选择题

Which of the following would NOT be an example of a public good as described in the passage（）

A．A taxicab
B．A bridge
C．A fire truck
D．A stoplight

单项选择题

Go back to your room and leave me ______.

A．alone
B．lonely
C．along
D．almost