2021年职称英语理工类B级完形填空练习

1、职称英语理工类B级完形填空练习 Scientists have been studying the germs on money for well over2 100 years. At the turn of the 20th 3 , some researchers began to suspect that germs living on money could spread disease. Most stu _s of germy money have looked at the germs on the currency 4 one country. In a new study,

2、 Frank Vriesekoop3 and other researchers pared the germ populations found on bills of different 5 . Vriesekoop3 is a microbiologist at the University of Ballarat in Australia4. He led the study, which pared the germ populations found on money 6 from 10 nations. The scientists stu _d 1,280 banknotes

3、in total; all came from pla _s where people buy food, like super _rkets street vendors and cafes, 7 those businesses often rely on cash. Overall, the Australian dollars hosted the fewest live bacteria - no more than 10 per square _ntimeter. Chinese yuan had the most - about 100 per square _ntimeter.

4、 Most of the germs on money probably would not cause harm. What we call paper money usually isnt _de from paper. The U. S. dollar， for example， is printed on fabric that is mostly 8 .Different countries _y use different 9 to print their money. Some of the currencies stu _d by Vriesekoop and his 10 s

5、uch as the American dollar were _de from cotton. Others were _de 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 _de 12 of cot

6、ton. Fewer germs lived on the polymer notes. This connection suggests that 13 have a harder time staying alive on polymer su _ _s. Scientists need to do more stu _s to understand how germs live on money-and whether or not we need to be con _rned. Vnesekoop is now starting a study that will 14 the am

7、ounts of time bacteria can stay alive on different types of bills. Whatever Vriesekoop finds， the fact re _ins： 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. pesos n .比索 bacterium /k？kti？ri？m/ n .细菌（单数） germ n.病菌 bacteria /b？kti？ri？/细菌（复数） banknote