[单项选择]Germs（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 usedifferent currencies, but these countries, and probably all countries, still have one thing in (51)（变化）: 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 different (54). Vriesekoop is a microbiologist at the University of Ballarat in Australia. He led the study, which compared the germ populations found on money __ (55) from 10 nations. The scientists studied l,280 banknotes in total; all ca
A. cheques
B. currencies
C. tickets
D. notebooks

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[单项选择]Germs（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 usedifferent currencies, but these countries, and probably all countries, still have one thing in ______ (51)（变化）: 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 different ______ (54). Vriesekoop is a microbiologist at the University of Ballarat in Australia. He led the study, which compared the germ populations found on money ______ (55) from 10 nations. The scientists studied l,280 banknotes in total; all ca
A. doubt
B. danger
C. common
D. advance

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A

Germs (细菌)
Have you ever been ill When there is illness, there can be no happiness. When you are ill, you are unhappy, for your body becomes hot, and there are pains all over your body. You don’t want to work. You stay in bed, and are very sad.
What makes us ill
Germs are everywhere. They are very small. You can’t see them with your eyes but you can see them with a microscope (显微镜). They are like the seeds of plants, but they are much smaller. They are very, very small and there could be hundreds of them on a very small thing.
Germs aren’t found only in water. They are found in air and dust (灰尘), too. If you cut your finger, and if some of the dust from the floor goes into the cut, some of the germs will go into your finger. Your finger will become big and red, and you will have much pain in it. Sometimes the germs can go all over your body, and you will have pain everywhere.

What
A. Illness makes you unhappy and sad.
B. If you lie on bed, you must be ill.
C. If you don’t want to work, you must be ill.

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