练习1 exchange of goods became difficult because _________.
a: man became more civilized
b: smiths began to look after land or cattle in their spare time
c: more and more goods which had no fixed exchange values came to the marker
d farmers hadnt enough grain or meat to provide for skilled workers
2 money was not used until _______.
a: paper was invented
b: people practiced a simple process of exchange
c: nothing could be offered in exchange
d: the exchange of one thing for another became too complicated
3 the best title for this passage is _____.
a: what is money
b: what are moneys functions.
c: the importance of money
d: the beginning of money
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