What we call paper money usually isnt made from paper. The U. S. dollar, for example, is printed on fabric that is mostly 8__________ .Different countries may use different 9__________ to print their money. Some of the currencies studied by Vriesekoop and his 10__________ such as the American dollar were made from cotton. Others were made from polymers.
The three 11__________ with the lowest numbers of bacteria were all printed on polymers. They included the Australian dollar, the New Zealand dollar and some Mexican pesos.
The other currencies were printed on fabric made 12__________ of cotton. Fewer germs lived on the polymer notes. This connection suggests that 13__________ have a harder time staying alive on polymer surfaces. Scientists need to do more studies to understand how germs live on money-----and whether or not we need to be concerned. Vnesekoop is now starting a study that will 14__________ the amounts of time bacteria can stay alive on different types of bills.
Whatever Vriesekoop finds, the fact remains: Paper money harbors germs We should wash our 15 after touching it; after all5__________, you never know where your money s been. Or whats living on it
练习:
1. A coins B money C cheques D loans
2. A different B clean C hard D foreign
3. A anniversary B year C decade D century
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