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  3. Germs (细菌）on Banknotes People in different countries use diffenent types of ...

Germs (细菌）on Banknotes People in different countries use diffenent types of ...

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问题 Germs (细菌）on Banknotes
People in different countries use diffenent types of money： yuan in China, pesos in Mexico，pounds in the United Kingdom ,dollars in the United States, Australia and New Zealand. They may use different currencies ,but these countries, and probably all countries, still have one thing in_(51) ： Germs on the banknotes.
Scientists have been studying the gerrns on money for well over 100 years. At the turn of the 20th ______ (52)，some researchers began to suspect that germs living on money could spread disease.
Most studies of germy money have looked at the germs on the currency (53) one country. In a new study ,Frank Vriesekooppnd other researchers compared the germ populations (族群）found on bills of different_(54).
Vriesekoop is a microbiologist at the University of Ballarat in Australia. He led the study,which compared the germ population found on money_ (55) from 10 nations.
The scientists studied 1,280 banknotes in total； all came from places where people buy food, like supermarkets, street vendors (小贩）cafes, (56) those businesses often rely on cash.
Overall, the Australian dollars hosted the fewest live bacteria — no more than 10 per square centimeter. Chinese yuan had \the/ ( 57) — about 100 per square centimeter. Most of the germs on not cause harm.
What we call “paper money” V (58) isn’t made from paper. The U. S. dollar, for example, is printed on fabric that is mostly cotton. Different countries may use different (59) to print their money. Some of the currencies studied by Vriesekoop and his team, such as the American dollar, were made from cotton. Others were made from polymers (聚合物）
The three_(60) 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 (61) currencies were printed on fabric made mostly of cotton. Fewer germs lived on the polymer notes. This (62) suggests that germs have a harder time staying alive on polymer surfaces. Scientists need to do more studies to understand__ (63) germs live on money — and whether or not we need to be concerned. Vriesekoop is now starting a study that will (64) the amounts of time bacteria can stay alive on different types of bills.
Whatever Vriesekoop finds，the fact remains： Paper money (65) germs. We should wash our hands after touching it； after all, you never know where your money has been. Or what’s living on it.
选项 A century
B period
C year
D decade
答案A
解析the 20th后面只能是 century, At the turn of 20th century 的意思是：在 20 世纪之初。
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