专八改错练习第十七篇：

Industrial growth in countries had formerly beenmarkets __1__
hastened regional self-sufficiency and, in theconsequence, __2__
hastened the collapse of organized long-distance trade.This process was intensified by the spread of a newmetal, iron.
In almost 1400 B.C. new smelting techniques led to thehigh __3__
temperatures which could produce an iron superior in
strength to bronze. Probably developing in northeastern __4__
Turkey, this process spread over Europe considerately more __5__
rapidly than the art of processing bronze.This rapid
spread was due not only particularly war and the movements __6__
of people, but chiefly, to the wide occurence of iron ore as well. __7__
Iron was available for smelting in almost every land and, in
efficiency,iron forging offered almost every country the __8__
prospect of economical self-sufficiency. It was eagerly seized __9__
upon, and the bottom fell out of the bronze market and the
general economics. Trade stagnated, ships were laid up, and __10__
a recession set in.
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