单项选择题

What does the passage mainly discuss

A．The problems faced by leaders.
B．How leadership differs in small and large groups.
C．How social groups determine who will lead them.
D．The role of leaders in social groups.

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单项选择题

What determines the price of a good in a market economy

A．The cost of all elements in production.
B．The cost of not making other goods.
C．The efficiency of the manufacturing process.
D．The quantity of materials supplied.

单项选择题

Which of the following examples BEST reflects a cost to society as defined in the passage

A．A family buying a dog.
B．Eating in a restaurant instead of at home.
C．Using land for a house instead of a park.
D．Staying at home instead of going to school.