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2012年职称英语教材(理工类)完形填空新增内容
People in different countries use different types of 1 ：yuan in China，pesos in Mexico, pounds in the United Kingdom，dollars in the United States，Australia and New Zealand．
They may use 2 currencies，but these countries，and probably all countries，still have one
thing in common：Germs on the banknotes．Scientists have been studying the germs on money for well over 100 years．
