单选题：阅读短文，回答题。Salt，shells or metals are still used as money in ou

阅读短文，回答题。
Salt，shells or metals are still used as money in out-of-the-way parts of the world today．Salt may seem rather a strange 63 to use as money，64in countries where the food of the people is mainly vegetable，it is often an 65 necessity．Cakes of salt，stamped to show their 66，were used as money in some countries until recent 67，and cakes of salt 68 buy goods in Borneo and parts of Africa．
Sea shells had been 69 as money at some time 70 another over the greater part of the Old World．These were 71 mainly from the beaches of the Maldives Islands in the Indian Ocean，and were traded to India and China．In Africa，shells were traded right across the 72 from East to West．
Metal．valued by weight，73 coins in many parts of the world．Iron．in lumps，bars or rings．is still used in many countries 74 of paper money．It can either be exchanged 75 goods，or made into tools，weapons，or ornaments．The early money of China，apart from shells，was of bronze，76 in flat，round pieces with a hole in the middle，called “cash”．The 77 of these are between three thousand and four thousand years old-older than theearliestcoinsof theeastern Mediterranean．
Nowadays．coins and notes have 78 nearly all the more picturesque 79 of money，and 80 in one or two of the more remote countries people still hold it for future use on ceremonial 81 suchasweddingsand funerals，examples of 82 money will soon be found only in museums．