单项选择题

According to the passage, finding out the social costs of a public good is a （）

A．difficult procedure
B．daily administrative duty
C．matter of personal judgment
D．citizen' s responsibility

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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.

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