共用题干

共用题干
Cerms（细菌） on Banknotes

People in different countries use different 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 cur-
rencies,but these countries,and probably all countries,still have one thing in ________(51):germs on
the banknotes.
Scientists have been studying the germs 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 Vriesekoop and other researchers compared the germ populations found on bills of dif-
ferent ________(54）
Vriesekoop is a microbiologist at the University of Ballarat in Australia.He led the study,which corn-
pared the germ populations 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 and
cafes,
________ (56)those businesses often rely on cash.
Overall,the Australian dollars hosted the fewest live bacteria一no more than 10 per square centimeter.
Chinese yuan had the________(57）一about 100 per square centimeter. Most of the germs on money
probably would not cause harm.
What we call "paper money"________(58)isn'tmade 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.
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一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's been.Or what's living on it.

_________(54)
A:countries
B:areas
C:regions
D:provinces