单项选择题

According to the passage, public goods are______.

A．services enjoyed by all people
B．what we can buy and sell in public
C．products that we make for national defense
D．taxes paid by the people involved

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热门试题

单项选择题

In the third paragraph the author explains______.

A．what role the market system plays in producing public goods
B．how weak the market system is in producing public goods
C．why some people refuse to pay for public goods
D．what we can do to make use of the market system

单项选择题

______ today, he would get there by Friday.

A．Was he leaving
B．Would he leave
C．Were he to leave
D．If he leaves