题目

题型：不详难度：来源：

It doesn’t kill germs better than cooler water, but turning tap temperatures high, the US burns carbon equal to the emissions of Barbados.
People typically wash their hands seven times a day in the United States, but they do it at a far higher temperature than is necessary to kill germs, a new study says. The energy waste is equivalent to the fuel use of a small country.
It’s cold and flu season, when many people are concerned about avoiding germs. But forget what you think you know about hand washing, say researchers at Vanderbilt University. Chances are good that how you clean up is not helping you stay healthy; it is helping to make the planet sick.
Amanda R. Carrico, a research assistant professor at the Vanderbilt Institute for Energy and Environment in Tennessee, told National Geographic that hand washing is often “a case where people act in ways that they think are in their best interest, but they in fact have inaccurate beliefs or outdated perceptions.”
Carrico said, “It’s certainly true that heat kills bacteria, but if you were going to use hot water to kill them it would have to be way too hot for you to tolerate.”
She explained that boiling water, 212°F (99.98°C), is sometimes used to kill germs - for example, to clean drinking water that might be polluted with germs. But “hot” water for hand washing is generally within 104°F to 131°F (40°C to 55°C.) At the high end of that range, heat could kill some germs, but the sustained contact that would be required would scald the skin.
Carrico said that after a review of the scientific literature, her team found “no evidence that using hot water that a person could stand would have any benefit in killing bacteria.” Even water as cold as 40°F (4.4°C) appeared to reduce bacteria as well as hotter water, if hands were scrubbed, rinsed（冲洗）and dried properly.
In fact, she noted that hot water can often have an unfavorable effect on hygiene. “Warmer water can harm the skin and affect the protective layer on the outside, which can cause it to be less resistant to bacteria,” said Carrico.
Using hot water to wash hands is therefore unnecessary, as well as wasteful, Carrico said, particularly when it comes to the environment. According to her research, people use warm or hot water 64 percent of the time when they wash their hands. Using that number, Carrico’s team calculated a significant impact on the planet. 
“Although the choice of water temperature during a single hand wash may appear minor, when multiplied by the nearly 800 billion hand washes performed by Americans each year, this practice results in more than 6 million metric tons of CO2 equivalent emissions annually,” she said.
That’s roughly equal to the emissions of two coal-fired power plants, or 1,250,000 passenger vehicles, over the course of a year. It’s higher than the greenhouse gas emissions of small countries like El Salvador or Armenia, and is about equivalent to the emissions of Barbados. If all US citizens washed their hands in cooler water, it would be like eliminating the energy-related carbon emissions of 299,700 US homes, or the total annual emissions from the US zinc or lead industries. 
The researchers found that close to 70 percent of respondents said they believe that using hot water is more effective than warm, room temperature, or cold water, despite a lack of evidence backing that up, said Carrico. Her study noted research that showed a “strong cognitive（认知的） connection” between water temperature and hygiene in both the United States and Western Europe, compared to other countries, like Japan, where hot water is associated more with comfort than with health.
The researchers published their results in the July 2013 issue of International Journal of Consumer Studies. They recommended washing with water that is at a “comfortable” temperature, which they noted may be warmer in cold months and cooler in hot ones.
小题1:What does the writer mainly focus on when writing this passage?

A．Whether hot water helps kill germs effectively in hand washing.

B．How hot water contributes to the serious worsening of our planet.

C．Why the consumption of hot water is unnecessary and wasteful.

D．What the advantages and disadvantages of using hot water are.

小题2:The underlined word scald in paragraph six probably means         .

A．burn

B．improve

C．soften

D．wrinkle

小题3:According to the passage, all the following share roughly the same CO2 emissions yearly EXCEPT         .

A．two coal-fired power plants	B．US zinc or lead industries
C．1,250,000 passenger vehicles	D．El Salvador or Armenia

小题4:Which of the following is WRONG according to the passage?
A. Boiling water at 212°F (99.98°C) works effectively in killing germs.
B. Warmer water can damage the protective layer of the outside skin.
C. There is much difference between cold water and hot water in reducing bacteria.
D. Americans have inaccurate beliefs or outdated perceptions in hand washing.
小题5:Which of the following is the standard of a comfortable water temperature for washing hands?
A. Warmer in winter and cooler in summer.    
B. Between 104°F to 131°F (40°C to 55°C).
C. Below 104°F (40°C) or above 131°F (55°C).  
D. Warm enough to kill germs and clean up.
小题6: If you want to read stories of this kind afterwards, which of the following magazines will you probably subscribe to?

A．Universal Science Fiction	B．Science & Discoveries
C．Environment & Protection	D．Exploration of America

答案

小题1:A
小题２:A
小题３:D
小题４:C
小题５:A
小题６:B

解析

试题分析：文章对人们普遍认为的热水洗手比冷水洗手更加有效的观点进行纠正，通过实验和科学依据表明热水并不能***死细菌，反而会对环境造成伤害。
小题1:主旨题：通读全文和第一段的句子：It doesn’t kill germs better than cooler water, but turning tap temperatures high, the US burns carbon equal to the emissions of Barbados.可知这篇文章讲的是热水是否能***死细菌，选A。
小题２:猜词题：从第六段的句子：But “hot” water for hand washing is generally within 104°F to 131°F (40°C to 55°C.) At the high end of that range, heat could kill some germs, but the sustained contact that would be required would scald the skin.可知热水在104°F to 131°F (40°C to 55°C.)，但是温度太高会烫伤皮肤，所以选A。
小题３:细节题：从倒数第三段的句子：That’s roughly equal to the emissions of two coal-fired power plants, or 1,250,000 passenger vehicles, over the course of a year. or the total annual emissions from the US zinc or lead industries.可知每年排放同样二氧化碳的是：两个煤炭发电厂，1，250，000辆车，和美国的锌，铅产业，而第二段的句子：It’s higher than the greenhouse gas emissions of small countries like El Salvador or Armenia, and is about equivalent to the emissions of Barbados.说明El Salvador or Armenia是低于这个数量的，选D。
小题４:推理题：从倒数第二段的句子：The researchers found that close to 70 percent of respondents said they believe that using hot water is more effective than warm, room temperature, or cold water, despite a lack of evidence backing that up, 可知很多人认为用热水洗手比冷水洗手更加有效，但是这是没有根据的，所以C是错的。
小题５:细节题：从最后一段的句子：They recommended washing with water that is at a “comfortable” temperature, which they noted may be warmer in cold months and cooler in hot ones.可知舒服的水温应该是冷天感到暖和的水和热天感到冷的水，选A。
小题６:文章出处题：这篇文章是对人们生活中的误区加以纠正，用实验证明，给出科学依据，所以是科学探索类的文章，选B