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 |
We do not know exactly how many whales there are in the sea because we can’t count them. But we believe at the beginning of the eighteenth century there were 105,000 humpback whales and 120,000 right whales. At the beginning of the twentieth century there were 75,000 humpbacks and 80,000 rights.
Since 1900 their numbers have fallen very quickly. Between 1935 and 1950 the number of humpbacks fell from 20,000 to 10,000 and since 1950 the number has fallen to only 6,000. The number of right whales has fallen even faster. In 1935 there were 25,000. The number fell to 6,000 in 1950 and since 1950 the number has fallen to 4,000. Men have always been hunters. Thousands of whales have become victims(牺牲品). It’s time to do something to protect whales.Which of the following is true?
| A．We know the exact number of whales in the sea. |
| B．It’s easy for us to count whales in the sea. |
| C．We find it impossible to count whales in the sea. |
| D．We don’t want to know how many whales there are in the sea. |
The number of right whales has fallen _______.
| A．more slowly than that of humpback whales |
| B．faster than that of humpback whales |
| C．as slowly as that of humpback whales |
| D．as fast as that of humpback whales |
The passage is mainly about _______.
| A．the number of humpback whales |
| B．the number of right whales |
| C．hunting whales |
| D．the necessity of protecting whales |
◇ Share Flats Happy Valley big flat, 1 room ready for use immediately. Quiet and convenient, fully furnished, park view. $6, 800 including bills with maid. Female nonsmoker. No pet. Sara 25720836 or 10077809.
◇ Moving Sale 2 armchairs, red/brown at $400 each; coffee table, black, wood, $800; oil painting, big, $900; Tianjin carpet, green 3×7, $600; double bed, $500; mirror, big, square, $500; fridge, big, double-door, $1000; old pictures, $140, up, each; plants, big and small. Tel: Weekend, 2521-6011/Weekday, 2524-5867.
◇ Part-time Laboratory Assistant Wanted Required by busy electronics(电子) company to help with development of computer. Should have an electronics degree and some practical experience of working in an electronics laboratory. Hours 9:30 a.m.-1:00 p.m. Mon.-Fri. Fourteen days paid leave. Salary ￥6598-10230 dependent on experience. Letter of application to: Mrs. G Chan, NOVA ELECTRONICS, 45 Gordon Rd, Hung Hom Kowloon. The one who put on the first ad probably wants to _______.
| A．rent(租) a beautiful flat of her own in Happy Valley |
| B．find another lady to share the cost to rent a flat |
| C．share her room in a flat with whoever has no pet |
| D．take on a maid to look after herself and the flat |
according to the ads, you may _______.
| A．buy an old picture for $150 |
| B．call at 25720836 and see a beautiful park |
| C．buy two armchairs for $ 400 |
| D．hire a maid by paying $6 800 |
If you want to buy some old furniture, you should_______.
| A．get in touch with NOVA ELECTRONICS |
| B．call at 2524-5867 any day except Monday |
| C．do it before you move to another place |
| D．call at either 2524-5867 on Monday or 2521-6011 on Saturday |
Once you can get a part-time job in NOVA ELECTRONICS, _______.
| A．you have to work at least 4 hours a day |
| B．you should write a letter to Mrs. G Chan |
| C．you will be given 14 days off each year besides weekends |
| D．you will get no more than $6 598 each month |
People like different kinds of vacations. Some go camping. They swim, fish, cook over a fire and sleep outside. Others like to stay at a hotel in an exciting city. They go shopping all day and go dancing all night. Or maybe they go sightseeing to places such as Disneyland, the Tai Mahan or the Louver.
Some people are bored with sightseeing trips. They don’t want to be “tourists”. They want to have an adventure--a surprising and exciting trip. They want to learn something and maybe help people too. How can they do this? Some travel companies and environmental groups are planning special adventures. Sometimes these trips are difficult and full of hardships, but they’re a lot of fun. One organization, Earth watch, sends small groups of volunteers to different parts of the world. Some volunteers spend two weeks and study the environment. Others work with animals. Others learn about people of the past.
Would you like an adventure in the Far North? A team of volunteers is leaving from Mormons, Russia. The leader of this trip is a professor from Alaska. He’s worried about chemicals from factories. He and the volunteers will study this pollution in the environment. If you like exercise and cold weather, this is a good trip for you. Volunteers need ski sixteen kilometers every day.
Do you enjoy ocean animals? You can spend two to four weeks in Hawaii. There, you can teach language to dolphins. Dolphins can follow orders such as “Bring me the large ball.” They also understand opposites. How much more can they understand? It will be exciting to learn about these intelligent animals. Another study trip goes to Washington State and follows orcas. We call orcas “killer Whale”, but they’re really dolphins—the largest kind of dolphin. This beautiful animal travels together in family groups. They move through the ocean with their mothers, grandmothers and great-grandmothers. Ocean pollution is chasing their lives. Earth watch is studying how this happens.
Are you interested in history? Then Greece is the place for your adventure. Thirty-five hundred years ago a volcano exploded there, on Santorum. This explosion was more terrible than Karate or Mount Saint Helens. But today we know a lot about the way of life of the people from that time. There are houses, kitchens, and paintings as interesting as those in Pompeii. Today teams of volunteers are learning more about people from the past.
Do you want a very different vacation? Do you want to travel far, work hard and learn a lot? Then an Earth watch vacation is for you.The Tai Mahan may be _______.
| A．a shopping center | B．a hotel |
| C．a dancing hall | D．a place of interest |
From the passage, on an adventure trip, people ______.
| A．may not spend much time on sightseeing |
| B．won’t meet some difficulties or hardships |
| C．can’t enjoy them |
| D．can’t learn something |
If you want to learn something about people of the past, you can _______.
| A．join the team to Hawaii |
| B．join the team to the Far North |
| C．join the team to Washington |
| D．join the team to Greece |
The word intelligent in paragraph 4 means _______.
| A．exciting | B．beautiful |
| C．large | D．clever |
Which of the following is false?
| A．Some people find sightseeing trips boring. |
| B．Earth watch is planning all these special adventures. |
| C．The number of orcas is decreasing. |
| D．3 volcano explosions in all broke out 3, 500 years ago in Greece. |
When in 1789, George Washington became the first president of the United States, there was no permanent capital in which to house the government. During the Revolutionary War several different cities had served as the national capital. In addition, members of congress could not agree as to where this permanent capital should be located. Some officials wanted it in the north, others wanted it in the south. Each of the states hoped that the capital might lie within its own state lines. At last it was decided that the capital should occupy a section by itself, separate from any of the states. The place chosen was situated on the Potomac River. The land belonged originally to the state of Maryland, but Maryland agreed to the national government. The section was named the Washington. Work was begun on the new capital in 1791. in the year 1899 Congress occupied the new capital building at the same time the White House was opened as the home of all future presidents.Before the year 1800, the capital of America had been located in _______.
| A．Maryland | B．Washington |
| C．New York | D．several cities |
Why was it decided that the capital should be separated from any of the states? Because ________.
| A．the District of Columbia was on the borders of several states |
| B．the District of Columbia was in the center of America |
| C．Maryland insisted that the capital lie in its own state |
| D．Each of the states wanted the capital might lie within its own state |
The capital was named after _______.
| A．an explorer, who first found the place |
| B．the place where it occupied |
| C．the first president of the United States of America |
| D．a famous general who fought in the war |
Presidents of the United States live in ________.
| A．the capital building | B．Maryland |
| C．New York | D．the White House |
A desert is a beautiful land of silence and space. The sun shines, the wind blows, and time and space seem endless. Nothing is soft. The sand and rocks are hard, and many of the plants even have hard needles instead of leaves.
The size and location(分布) of the world’s deserts are always changing. Over millions of years, as climates change and mountains rise, new dry and wet areas develop. But within the last 100 yeas, deserts have been growing at a frightening speed. This is partly because of natural changes, but the greatest makers are humans.
Humans can make deserts, but humans can also prevent their growth. Algeria Mauritania is planting a similar wall around Nouakchott, the capital. Iran puts a thin covering of petroleum(石油) on sandy areas and plants trees. The oil keeps the water and small trees in the land, and men on motorcycles(摩托车) keep the sheep and goats away. The USSR and India are building long canals to bring water to desert areas. In this passage, “needles” refers to _______.
| A．small, thin pieces of steel. |
| B．long, thin pieces of branches. |
| C．small pointed growth on the stem(茎) of a plant. |
| D．small, thin pieces of sticks. |
Which of the following is NOT true?
| A．The greatest desert makers are humans. |
| B．There aren’t any living things in the deserts. |
| C．Deserts have been growing quickly. |
| D．The size of the deserts is always changing. |
People in some countries are fighting a battle against _______.
| A．the growth of deserts | B．the disappearance of desert plants |
| C．natural changes | D．congenital climate |
We can guess that Mauritania and Algeria belong to _______.
| A．Asian countries | B．American countries |
| C．European counties | D．African countries |
Choose the sentence which best gives the main idea of the passage.
| A．The deserts of the world are always changing. |
| B．Man is to take measures to control the growth of the world’s deserts. |
| C．Deserts are lands of silence and space. |
| D．Deserts have grown at a fast pace in the past 10 years. |
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