题目内容
根据以下内容，回答题。
Passage Three
Alaska， which was called Russian America before it was sold to U. S. A. ，joined the union as the forty-ninth state in 1959.
Alaska is now the largest of all the 50 states of the U. S..
It was in 1867 that President A. Johnson"s Secretary of State（国务卿） ，Seward bought Alaska from the Russians at a cost of 7.2 million. The buying of the huge northern land mass seemed at first something foolishly done. Not only was Alaska difficult to reach， but it was also hard to bye in， and it appeared to have no importance in time of war. Besides， there are volcanoes there as Alaska hes on the Pacific" ring of fire". In Alaska large treeless areas are covered with snow all the year. For these reasons the buying of Alaska was called "Seward"s Fooly" at that time.
However， in 1896 gold was found in Alaska， and people poured tin to the land quickly. Since then other important natural resources were discovered， including oil. Soon people changed their thinking about "Seward"s Fooly". But most people visit Alaska in order to see the endless beauty of nature that the northern land discloses to them. For instance， there are a- bout 11，000 islands in Alaska. And in a certain area of Alaska the sun does not set for 82 days
every year.
Alaska belonged to__________before 1867. 查看材料
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更多问题
According to the passage， coins once had real value currency because they__________.
改变航道原理是指执行计划时具有应变能力。()
根据以下内容，回答题。
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__________.
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