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 substa

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问题     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 substance to use as money, so in countries where the food 【M1】______
of the people is mainly vegetable, it is often an absolute necessity.
Cakes of salt, stamping to show their value, were used as money 【M2】______
in some countries until recent times, and cakes of salt still buys 【M3】______
goods in Borneo and parts of Africa.
    Sea shells had been used as money at some time and another 【M4】______
over the greater part of Old World. These were collected mainly 【M5】______
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 continent from East to West.
    Metal, valued by weight, proceeded coins in many parts of 【M6】______
the world. Iron, in lumps, bars or rings, is still used in many
countries instead of paper money. It can either be exchanged with 【M7】______
goods, or made into tools, weapons, or ornaments. The early
money of China, part from shells, was of bronze, often in flat, 【M8】______
round pieces with a hole in the middle, called "cash". The earliest
of these are between three thousand and four thousand years old —
older than the earliest coins of the eastern Mediterranean.
    Nowadays, coins and notes have been replaced nearly all the 【M9】______
more picturesque forms of money, and even in one or two of the 【M10】______
more remote countries people still keep it for future use on
ceremonial occasions such as weddings and funerals, examples of
primitive money will soon be found only in museums.
【M3】

选项

答案buys—buy

解析 主谓一致错误。此处谓语buy的主语是cakes而不是salt,因此不用动词第三人称单数,改为buy。
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