单项选择题

What is the main purpose of the passage

A．To outline contrasting types of economic systems.
B．To explain the science of economics.
C．To argue for the superiority of one economics systems.
D．To compare barter and money-exchange markets.

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单项选择题

The Romans used to sell by auction______.

A．spoilt goods
B．old worn-out weapons
C．property taken from the enemy
D．spears

单项选择题

The end of the bidding is called knocking down because______.

A．the person who offers the highest price wins
B．all the buyers win except one fail
C．the goods are knocked down on to the table
D．the auctioneer bangs the table with a hammer