1 . 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.
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case where people act in ways that they think are in their best interest, but they in fact have inaccurate beliefs or outdated perceptions.”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 a way too hot for you to tolerate.”
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.
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 unimportant, 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.
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.
1. What’s the meaning of what Carrico told National Geographic in the second paragraph?| A．People are more concerned about their health and begin to wash their hands. |
| B．It’s important for people to wash their hands to keep healthy. |
| C．Generally, people’s hand washing behaviors and perceptions are not correct. |
| D．People like washing their hands very much. |
| A．using hot water to wash hands has a bad influence on our planet. |
| B．air pollution has become more and more serious. |
| C．using hot water to wash hands is a waste of energy. |
| D．people should pay more attention to the environment around us. |
| A．fact and opinion | B．cause and effect |
| C．definition and classification | D．time and events |
| A．It’s necessary and useful for people to wash their hands frequently every day. |
| B．We can wash our hands with water that is at a “comfortable” temperature. |
| C．Using cold water to wash hands is necessary and much healthier. |
| D．Hot water can’t kill germs. |
Doctors use the word clinical depression to describe severe form of depression. Signs may include loss of interest or pleasure in most activities, low energy levels and thoughts of death or suicide.
In the new study, American investigators designed an experiment that exposed hamsters（仓鼠）to different colors. The researchers chose hamsters because they are nocturnal, which means they sleep during the day and are active at night. The animals were separated into four groups. One group of hamsters was kept in the dark during their night-time period. Another group was placed in front of a blue light, a third group slept in front of a white light, while a fourth was put in front of a red light. After four weeks, the researchers noted how much sugary water the hamsters drank. They found that the most depressed animals drank the least amount of water.
Randy Nelson, at Ohio State University, says animals that slept in blue and white light appeared to be the most depressed. “What we saw is that these animals didn’t show any sleep interruptions at all but they did mess up biological clock (生物钟) genes and they did show depressive sign but if they were in the dim red light, they did not.” He says there’s a lot of blue in white light. This explains why the blue light and white light hamsters appear to be more depressed than the hamsters seeing red light or darkness.
1. From the text we know that ________ made the hamster feel depressed.
| A．the amount of the water |
| B．the colour of the light |
| C．the loss of pleasure |
| D．the level of energy |
| A．To show how well they slept. |
| B．To see how much sugary water they drank. |
| C．To explain why they liked dark colours. |
| D．To find out what caused the depression on them. |
| A．reporting an experiment process |
| B．presenting research data |
| C．setting down general rules |
| D．giving his own experience |
| A．In a science magazine. |
| B．In a physics textbook |
| C．In a tourist guidebook. |
| D．In an official announcement. |
3 . Tayka Hotel De Sal
Where: Tahua, Bolivia
How much: About $95 a night
Why it’s cool: You’ve stayed at hotels made of brick or wood, but salt? That’s something few can claim. Tayka Hotel de Sal is made totally of salt—including the beds (though you’ll sleep on regular mattresses (床垫) and blankets).The hotel sits on the Salar de Uyuni, a prehistoric dried-up lake that’s the world’s biggest salt flat. Builders use the salt from the 4,633-square-mile flat to make the bricks, and glue them together with a paste of wet salt that hardens when it dries. When rain starts to dissolve the hotel, the owners just mix up more salt paste to strengthen the bricks.
Green Magic Nature Resort
Where: Vythiri, India
How much: About $240 a night
Why it’s cool: Riding a pulley(滑轮)-operated lift 86 feet to your treetop room is just the start of your adventure. As you look out of your open window—there is no glass!—you watch monkeys and birds in the rain forest canopy. Later you might test your fear of heights by crossing the handmade rope bridge to the main part of the hotel, or just sit on your bamboo bed and read. You don’t even have to come down for breakfast—the hotel will send it up on the pulley-drawn “elevator”.
Dog Bark Park Inn B&B
Where: Cottonwood, Idaho
How much: $92 a night
Why it’s cool: This doghouse isn’t just for the family pet. Sweet Willy is a 30-foot-tall dog with guest rooms in his belly. Climb the wooden stairs beside his hind leg to enter the door in his side. You can relax in the main bedroom, go up a few steps of the loft in Willy’s head, or hang out inside his nose. Although you have a full private bathroom in your quarters, there is also a toilet in the 12-foot-tall fire hydrant outside.
Gamirasu Cave Hotel
Where: Ayvali, Turkey
How much: Between $130 and $475 a night.
Why it’s cool: This is caveman cool! Experience what it was like 5,000 years ago, when people lived in these mountain caves formed by volcanic ash. But your stay will be much more modern. Bathrooms and electricity provide what you expect from a modern hotel, and the white volcanic ash, called tufa, keeps the rooms cool, about 65℉in summer.(Don’t worry—there is heat in winter.)
1. What is the similarity of the four hotels?| A．Being expensive. | B．Being beautiful. |
| C．Being natural. | D．Being unique. |
| A．The building of Dog Bark Park Inn B&B. |
| B．The name of a pet dog of the hotel owner. |
| C．The name of the hotel. |
| D．The name of the hotel owner. |
| A．Tayka Hotel De Sal |
| B．Green Magic Nature Resort |
| C．Dog Bark Park Inn B&B |
| D．Gamirasu Cave Hotel |
