题目内容
改变航道原理是指执行计划时具有应变能力。()
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Passage Two
In ancient times wealth was measured and exchanged in things that could be touched: food ，tools， and previous metals and stones. Then the barter system was replaced by coins， which still had real value since they were pieces of rare metal. Coins were followed by fiat money， paper notes that have value only because everyone agrees to accept them.
Today electronic monetary systems are gradually being introduced that will transform. money into even less tangible forms，reducing it to a series of "bits and bytes" ，or units of computerized information， going between machines at the speed of light. Already， electronic fund transfer allows money to be instantly sent and received by different banks， companies， and countries through computers and telecommunications devices.
According to the passage， which of the following was the earliest kind of exchange of wealth？ 查看材料
James Barfley probably never went to sea again because__________.
when we don"t want to be disturbed by 15 If we know how to use it，
We can 14 our mobile phone，
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