Germs on Banknotes
People in different countries use different types of 1__________ yuan in China， pesos in Mexico， pounds in the United Kingdom， dollars in the United States， Australia and New Zealand. They may use 2__________ currencies， but these countries， and probably all countries， still have one thing in common1： Germs on the banknotes.
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 studies of germy money have looked at the germs on the currency 4__________ one country. In a new study， Frank Vriesekoop3 and other researchers compared 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 compared the germ populations found on money 6__________ 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， 7__________ 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 most ---- about 100 per square centimeter. Most of the germs on money probably would not cause harm.
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
4. A along B with C within D outside
5. A countries B areas C regions D provinces
6. A delivered B borrowed C gathered D designed
7. A because B though C when D where
8. A plastic B rubber C cotton D paper
9. A languages B colors C substances D materials
10. A family B team C advisor D boss
11. A expenses B banks C statements D currencies
12. A nearly B mostly C likely D merely
13. A dirt B water C germs D oil
14. A compare B connect C conduct D command
15. A arms B hands C face D clothes
答案与题解：
1.B 冒号后面说的是各国使用钱币的名称：yuan in China ，pesos in Mexico，pounds in the United Kingdom ，dollars in the United States，Aus往alia and New Zealand，所以填人的词必定与这些钱币有关，而且应该是钱币的总括词。因此选 money 最为恰当。coins 是硬币，cheques 是支票，loans是贷款，它们都不会是答案。
2.A 本题的句子说的是：虽然各国使用的纸币各不相同，它们有一个共同点，那就是纸币上有病菌。四个选项中different 是答案。
3.D 选century 最合理。选 anniversary ，year 或decade都不合逻辑。
4.C 本段第二句提供了解答本题的线索。Frank Vriesekoop 的研究与以前的科学家的研究不同，他比较了各国钱币上的病菌数量，在他之前的科学家的研究范围局限于一个国家的纸币。四个选项中只有 within 表达在里的意思。
5. A 经过第四题选词的思索过程，本题的形容词很自然会在 different 之后用 countries，指不同的国家。
6. C 上一句说 Vriesekoop 比较不同国家纸币携带病菌的数量。本题的句子明确指出他对比的纸币涉及十个国家。四个选项中只有 gathered 与上下文的意思相匹配。
7. A 填词所在的句子与前面的主句存在因果关系。为什么要从食品店和食品摊收集纸币呢?因为这些地方常要用现金支付。本题答案是 because。
8. C fabric 是织物，其制作原料不会是 plastic或 rubber。选 paper 也不对，因为本句是说明纸币的制作原料通常不是纸。制作 fabric 的原料是 cotton，这是合乎常理的。而且该段倒数第二句也提供了答案。所以答案是 cotton。
9.D 本段说纸币的材料一般不是纸，通常是用棉花织物或高分子聚合物制作的。所以选择materials是正确的。
10. B 本题应当选 team。与 family ，advisor 或 boss 合作研究不是没有可能，但总有些离谱。与团队合作研究比较合理。
11. D 本段第二句提供了线索，它列出三种纸币，即 the Australian dollar ，the New Zealand dollar 和 some Mexican pesos。选 currencies 是最合理的。另外三个选项都不合适; expenses是支出，banks 是银行，statements 是账单。
12. B 本题只有选 mostly，上下文意思才连贯。
13. C 前一句说用高分子聚合物制作的钱币含菌数量较少。本题的句子接着分析说，在高分子聚合物上存活较难。谁存活较难?当然是病菌。本题答案是germs0 dirt， water 和oil 是非生物，不存在生存的问题。
14.A 四个选项填入句子后，句子成了：compare/connect/conduct/command the amounts of time bacteria can stay alive on different types of bills，很明显;connect /conduct /commandamounts of time是无法成立的。只有compare不同纸币上病菌存活的时间才是Vriesekoop 要研究的新课题。
15. B人们通常是用手接触纸币的。所以接触纸币后要洗手。答案是hands。