There are new findings that not enough sleep may cause people to gain weight.Researchers say a lack of sleep can produce hormonal changes that increase feelings of hunger.
In one study,researchers in the United States examined information on more than 1000 people.The people had taken part in a long-term study of sleep disorders.
Some people slept less than five hours a night.They had 15 percent higher blood levels of a hormone called ghrelin than people who slept eight hours.And they had 15 percent less of the hormone leptin.Experts say ghrelin helps make people feel hungry;leptin makes you feel full.
The scientists say these hormonal changes may be a cause of obesity in Western societies.They note the combination that limitation is common and is widely available.
The results were not affected by how much people exercised.People who are awake longer have more time to burn energy.But the researchers say loss of sleep may increase hunger especially for high-calorie foods,so people gain weight.It seems that,for survival,the body may be designed to store more fat during times with less sleep.
Researchers from Stanford University in California and the University of Wisconsin did the study.They found that the best amount of sleep for weight control is 7.7 hours a night.
The Public Library of Science published the findings in its journal Medicine.Internet users can read the full study,free of charge,at plos.org.Which of the following shows the right way in which lack of sleep causes weight gain?
| A．more ghrelin and less leptin→feeling hungry→eating more |
| B．feeling hungry→eating more→more ghrelin and less leptin |
| C．burning more energy→feeling hungry→eating more |
| D．more leptin and less ghrelin→feeling full→less exercise |
The two words missing in the 4th paragraph should be “_________”and “_________”.
| A．weight;sleep | B．sleep;food | C．hunger;food | D．weight;work |
When you sleep 7.7 hours a night,you will_________.
| A．have your ghrelin level rise and leptin level drop |
| B．have your leptin level rise and ghrelin level drop |
| C．have your ghrelin and leptin levels properly balanced |
| D．feel neither hungry nor full |
The writer wrote this passage to_________.
| A．make a news report | B．offer a piece of medical advice |
| C．make an advertisement | D．keep a record of the research findings |
Using too much water or throwing rubbish into our rivers are clear ways that humans can put our water supply in danger, but we also affect our water supply in less obvious ways. You may wonder how paving (铺砌) a road can lead to less useable fresh water. A major part of the water we use every day is groundwater. Groundwater does not come from lakes or rivers. It comes from underground. The more roads and parking lots we pave, the less water can flow into the ground to become groundwater.
Human activity is not responsible for all water shortages (短缺)．Drier climates are of course more likely to have droughts (干旱) than areas with more rainfall, but in any case, good management can help to make sure there is enough water to meet our basic needs.
Thinking about the way we use water every day can make a big difference, too. In the United States, a family of four can use 1.5 tons of water a day! This shows how much we depend on water to live, but there's a lot we can do to lower the number.
You can take steps to save water in your home. To start with, use the same glass for your drinking water all day. Wash it only once a day. Run your dishwasher (洗碗机) only when it is full. Help your parents fix any leaks in your home. You can even help to keep our water supply clean by recycling batteries instead of throwing them away.
Which of the following is most likely to lead to less groundwater?
| A．Using river water. |
| B．Paving parking lots. |
| C．Throwing batteries away. |
| D．Throwing rubbish into lakes. |
What can be inferred from the text?
| A．It takes a lot of effort to meet our water needs. |
| B．All water shortages are due to human behavior. |
| C．There is much we can do to reduce family size. |
| D．The average family in America makes proper use of water. |
The last paragraph is intended to ________.
| A．show us how to fix leaks at home |
| B．tell us how to run a dishwasher |
| C．suggest what we do to save water at home |
| D．prove what drinking glass is best for us |
The text is mainly about ________.
| A．why paving roads reduces our water |
| B．how human activity affects our water supply |
| C．why droughts occur more in dry climates |
| D．how much we depend on water to live |
“Indeed,” George Washington wrote in his diary in 1785, “some kind of fly, or bug, had begun to eat the leaves before I left home.” But the father of America was not the father of bug. When Washington wrote that, Englishmen had been referring to insects as bugs for more than a century, and Americans had already created lightning-bug(萤火虫). But the English were soon to stop using the bugs in their language, leaving it to the Americans to call a bug a bug in the nineteenth and twentieth centuries.
The American bug could also be a person, referring to someone who was crazy about a particular activity. Although fan became the usual term, sports fans used to be called racing bugs, baseball bugs, and the like.
Or the bug could be a small machine or object, for example, a bug-shaped car. The bug could also be a burglar alarm, from which comes the expression to bug, that is, “to install (安装) an alarm”. Now it means a small piece of equipment that people use for listening secretly to others’ conversation. Since the 1840s, to bug has long meant “to cheat”, and since the 1940s it has been annoying.
We also know the bug as a flaw in a computer program or other design. That meaning dates back to the time of Thomas Edison. In 1878 he explained bugs as “little problems and difficulties” that required months of study and labor to overcome in developing a successful product. In 1889 it was recorded that Edison “had been up the two previous nights discovering ‘a bug’ in his invented record player.”We learn from Paragraph 1 that ________.
| A．Americans had difficulty in learning to use the word bug |
| B．George Washington was the first person to call an insect a bug |
| C．the word bug was still popularly used in English in the nineteenth century |
| D．both Englishman and Americans used the word bug in the eighteenth century |
What does the word “flaw” in the last paragraph probably mean
| A．explanation. | B．finding. | C．origin. | D．fault. |
The passage is mainly concerned with________.
| A．the misunderstanding of the word bug |
| B．the development of the word bug |
| C．the public views of the word bug |
| D．the special characteristics of the word bug |
For years, I thought that my mother would become a centenarian（百岁老人）, but after 98 years and eight months, she recently died of old age. As it was with my father, her funeral took place in the most peaceful setting of the countryside of rural Washington County. Even after my father died, we continued to think of our parents as one. They were a team in the traditional sense. Church and family were their lifeline. They worked hard, never complaining. They expected to earn their daily bread by the sweat of their forehead.
Once during a conversation with Tom Brokaw, who wrote the bestselling book The Greatest Generation, I told him, “You left out my parents.” They didn’t go off to war, but they belonged to the Greatest Generation. They, too, were part of the foundation that made American truly great. They kept the home fires burning.
Our mother gloried in being a housewife and mother. Having been a teacher in her early adult years, when education was more than important than anything else, she gave up her job to raise a family. She was an excellent cook, but she had to cook on a wood stove（火炉）. There was no refrigerator, nothing electric. But nobody was ever better at making do（凑合着用）. In addition to all the housework, she went to the fields every day to help produce a crop to pay the rent to provide for the family. She and my dad worked hard to save every penny possible.
They saved every penny to buy a farm late in life. They also saved enough money to live out their respective lives with home care without taking up residency in a nursing home. They were very independent. If you had suggested they accept a government transfer payment, they would have spit in your eye.
Which of the following is the best title for the passage?
| A．Mother played a great part in the family. |
| B．Mother died at the age of 98 years old. |
| C．Mother was buried by the side of father. |
| D．Mother survived father by many years. |
The underlined word “one” in the passage means ________.
| A．parent | B．Centenarian | C．hero | D．entirety |
What do we know about Tom Brokaw?
| A．He is one of the author’s parents’ friends. |
| B．He likes talking with the author’s parents. |
| C．He takes up a position as a writer. |
| D．He is good at managing a home. |
How does the author find his parents?
| A．Brave and hardworking |
| B．Modest and warmhearted |
| C．Economical and independent |
| D．Respective and satisfied |
Plan on traveling around the USA this summer. If you need help in arranging the trip, or want ideas about where to go and what to do, there are a number of outstanding websites that can make your American dream come true.
www.byways. org
The National Scenic Byways Program covers l50 memorable roads. Some are natural routes, such as Route l along the California coast. Others focus on history(such as Route 6) or man-made attractions (the Las Vegas Trip). For each, you are provided with a map, told the route’s length and how long is allowed, and given detailed suggestions on sights and stop-offs.
www. oyster. com
This is the best website for reviews of hotels in US cities and resorts. The reviews are impressively thorough--covering locations, rooms, cleanliness, food and so on. Importantly, these are not promotional photos by the hotels, but more honest and revealing ones taken by inspectors. Search facilities are excellent. From the 243 hotels reviewed in the New York, you can narrow down what you are looking for by locations, facilities and styles, or just pick out a selection of the best.
www. 101usaholidays. co. uk
This is the latest offering that features l01 holiday ideas to the USA. It’s an impressively diverse selection, ranging from touring in the footsteps of Martin Luther King to a golfing break in Arizona and a cycling and wine—tasting trip in California’s Napa Valley. Narrow down what you are looking for--whether by price, region, theme and who will be traveling--and then just the photos of the relevant holidays remain on view. It’s a really clever design.
www. mousesavers. com
Walt Disney World in California can make dreams come true, but the price is not affordable for the majority of people.
So turn to long established Mousesavers. com, dedicated to giving big discounts on tickets, hotels and dining at Walt Disney World. The website also offers general money—saving tips, suggestions for cheap and free stuff and brief coverage of other Florida and California theme parks.
If you are going to the USA for the man-made attractions, you can drive along________.
| A．Route l | B．Route 6 |
| C．the Las Vegas Trip | D．the California coast |
Why are the photos of the hotels in US cities and resorts real in www. oyster. com?
| A．Because they were taken by customers who once lived there. |
| B．Because there are comments of customers on each photo. |
| C．Because there are qualifications of the authority. |
| D．Because they are taken by inspectors of the website. |
Travel ideas for a big family with kids and the old are available at .
| A．http://byways. org | B．www. oyster. com |
| C．www. 101 us holidays. co. uk | D．www. mouse savers. com |
Where does the text probably come from?
| A．A news report. |
| B．A tourist brochure. |
| C．A culture journal. |
| D．A health column |
Are morning people born or made? In my case it was definitely made. In my early 20s, I hardly went to bed before midnight, and I would always get up late the next morning.
But after a while I couldn’t ignore the high relationship between success and rising early. On those rare occasions where I did get up early, I noticed that my productivity (效率) was always higher. So I set out to become a habitual early riser. But whenever my alarm went off, my first thought was always to stop that noise and go back to sleep. Eventually some sleep research showed that my strategy was wrong.
The most common wrong strategy is this: supposing you’re going to get up earlier, you’d better go to bed earlier. It sounds very reasonable, but will usually fail.
There are two main schools (流派) of thought on sleep patterns. One is that you should go to bed and get up at the same time every day. The second school says you should go to bed when you’re tired and get up when you naturally wake up. However, I have found both are wrong if you care about productivity. If you sleep at fixed hours, you’ll sometimes go to bed when you aren’t sleepy enough. You’re wasting time lying in bed awake.
My solution is to combine both methods. I go to bed when I’m sleepy and get up with an alarm clock at a fixed time. So I always get up at the same time (in my case 5 a.m.), but I go to bed at different times every night.
However, going to bed only when I’m sleepy, and getting up at a fixed time every morning are my ways. If you want to become an early riser, you can try your own.Why did the author want to become a habitual early riser?
| A．Because he / she found that the productivity was higher. |
| B．Because he / she wanted to do morning exercise. |
| C．Because he / she wanted to test which school is better. |
| D．Because he / she wanted to have more sleep time. |
The author experienced all the following EXCEPT ________.
| A．going to bed after midnight |
| B．asking scholars for advice on sleeping habits |
| C．getting up early occasionally |
| D．pressing off the alarm to go on sleeping |
What’s the author’s sleep pattern?
| A．Going to bed early and getting up early. |
| B．Going to bed late and getting up late. |
| C．Going to bed when sleepy and getting up at a fixed early time. |
| D．Going to bed early and getting up late. |
The passage is mainly about ________.
| A．main schools of thought on sleep patterns |
| B．how to have a good sleep |
| C．wrong strategies for getting up early |
| D．how to become an early riser |
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