A healthy dose of sunshine may be the secret to staying young, British scientists have disclosed.
Vitamin D is produced naturally by the skin in response to sunlight and may help to slow the ageing process and protect against heart disease, according to the study.
Researchers from King's College London studied 2,160 women a
ged between 18 and 79, looking at their telomeres - a biological marker of ageing found in DNA．As people get older, their telomeres get shorter and they are easy to have illnesses.
But the study found women with high levels of vitamin D had comparatively longer telomeres - a sign of being biologically younger and healthier.
The study suggests vitamin D may help to slow down the ageing process of DNA, and therefore the ageing process as a whole.
Lead researcher Dr Brent Richards said: "These results are exciting because they prove for the first time that people who have higher levels of vitamin D may age more slowly than people with lower levels of vitamin D．
"This could help to explain how vitamin D has a protective effect on many ageing related diseases, such as heart disease and cancer."
He said further studies are required to confirm the findings.
Professor Tim Spector, head of KCL's twin research unit, and a co-author of the report, added: "Although it might sound absurd(荒谬的), it's possible that the same sunshine which may increase our risk of skin cancer may also have a healthy effect on the general ageing process."
Vitamin D made by the action of sunlight on the skin accounts for 90 per cent of the body's supply, but lower levels can also be obtained through food such as fish, eggs and breakfast cereals.
Other studies have suggested the vitamin plays a key role in protecting against cancer and heart disease.What’s the best title of this passage?
| A．Sunshine helps to keep you young. |
| B．Vitamin D has a protective effect on many diseases. |
| C．Telomeres - a biological marker of ageing. |
| D．People have found the secret to having a long life. |
How can people get Vitamin D?
A.through water. B. through sunshine.
C.through food. D.both B and C.Which of the following is not true according to the passage?
| A．women with high levels of vitamin D shows a sign of being biologically younger and healthier. |
| B．vitamin D has a protective effect on many ageing related diseases. |
| C．too much sunshine may increase our risk of skin cancer. |
| D．It has been proved that sunshine helps to keep you young. |
Computers are very important to modern life. Many people think that in the future computers will be used in lots of everyday life. It is thought that we won’t have to go shopping because we will be able to get most things which are sold in shops on the Internet. There will be no more books because we will be able to get all texts from computers. The Internet will be used to play games, see films and buy food. Most telephone calls will be made by computers, too.
Some people are glad about these new ways of shopping and communicating. Others do not think that computers will replace our old ways.
Let’s look at books, for example. Some people think that one day we will not read books made of paper. Instead, we will buy and read books using computers. We will read texts on small pocket computers. The computers will keep many different books in them at the same time. We won’t need to turn lots of pages and paper will be saved. Computerized(计算机化) books will be used more and more.
Is Internet shopping such a pleasure as going to the shop? Many people say it is not. It is a pleasure to go into shops and look at things you want to buy. It is also unlikely that many people will want to read large texts on our computers. Because paper books will perhaps be more friendly. Maybe computers won’t change these two habits.In paragraph 1 it is thought people will use computers for ___.
| A．playing games, shopping and making telephone calls |
| B．making telephone calls, having meals and seeing films |
| C．seeing films, buying food, and going for holidays |
| D．playing games, making telephone calls and seeing the doctor |
Which reason for using computerizes books is NOT said in the passage?
| A．Computerized books won’t be very expensive. |
| B．Computers can keep many different books in them. |
| C．We won’t have lots of pages. |
| D．We won’t need any paper. |
Paragraph 4 tells ___.
| A．about the old and new ways of shopping and communicating |
| B．if the Internet will change our habits |
| C．about computerized books |
| D．about future uses of computers |
The title for this passage is ___ .
| A．Computers will replace shops and books |
| B．Computers are the future |
| C．Computers will do everything for man |
| D．How computers change our habits |
Do you spirits soar (猛增) on a sunny day? Do you relax at the sound of flowing water?
Some scientists suggest that these contacts with nature are good for your health. In one study, hospital patients with a view of trees had shorter hospital stays and less need for pain medications. Another study indicated that prisoners with a view of the outdoors had fewer doctor visits.
“Why the desire for nature? Maybe we’re programmed to need it, since our ancestors’ survival was so dependent on their connection with nature,” suggests biologist E.O.Wilson.
Want to find out if contact with nature improves your outlook on life? Try a few of these ideas.
Hang out a bird feeder and watch the birds that visit it.
Sit down in the backyard or a nearby park. Close your eyes. What do you hear? Birds singing? The wind in the trees? Crickets(蟋蟀) chirping?
Find an anthill. Sit down and watch the ants work.
Take a walk right after a rainstorm. What looks different? Smells different?
Go barefoot on a sandy beach.
Open the curtains and the window, if the weather allows it.
On a windy day, watch the trees.
Go to a creek, river or park fountain. Listen to the sound of water in motion.
Camp out in the backyard or at a nearby state park. Use a tent or sleep on the ground.
Find a wide-open space to study the stars. Learn about the different constellations(星座).
Raise a garden. Or plant some seeds in a flowerpot.
Go hiking with your family. Talk about all of the colors you see in nature.
Take a camera and capture your nature experience.From Paragraph 2 we can learn that ___ .
| A．prisoners don’t like to go to the doctor when ill |
| B．trees can be used as pain medications |
| C．prisoners should often get out of prison to some into contact with nature |
| D．contacts with nature are very helpful for hospital patients |
According to E. O. Wilson, we desire nature probably because ___ .
| A．it can help us feel relaxed |
| B．we have inherited from our ancestors who were dependent on nature |
| C．people have lived with nature for thousands of years |
| D．contacts with nature can improve a person’s outlook on life |
The author gives us many ideas in order to let us ___.
| A．find out if contacts with nature improve our outlook on life |
| B．hear birds sing and watch ants work |
| C．talk about the colors we see in nature |
| D．capture our experience in nature |
From the passage, we can learn that ___。
| A．studying the constellations is important to everyone |
| B．you can know all the colors only by going hiking |
| C．nature is quite important to us |
| D．walking in a rain storm can be very helpful |
What is the best title of the passage?
| A．Go Hiking With Your Family |
| B．Let Nature Nurture You |
| C．Visit Your Doctor Less |
| D．Watch the Tree More Often |
What is a flood and where does it happen?
A flood occurs when water pours over dry land. Floods can cause big damage when they happen unexpectedly.
Heavy rain can cause floods. If a lot of rain falls quickly, the earth is unable to soak it up, and the water builds up on the ground. When it runs off into the rivers, the rivers overflow their banks.
The worst floods happen on land that is flat and low-lying. These areas of land are known as flood plains. Mud, earth, and large objects, like cars, can be carried long distances by flood water. Then, disease spreads quickly because the flood water is polluted.
What should I know if I live on a flood plain?
Stay away from flood water. It may be polluted.
Do not walk through moving water. It can knock you off your feet. If you must walk through water, walk where the water is not moving. Use a stick to test the ground in front of you.
Stay away from power lines that are on the ground. You could be electrocuted(电死)。
If you are scared, share your fears with an adult. Floods can be terrible, but remember-the water ALWAYS goes away!
What dangers does a flood lead to?
Electrocution from power lines
Dangerous animals coming out
Drowning
What should I do if a flood happens?
Get to the meeting place of your family.
Try to get to higher ground.
Listen to your family and follow all instructions carefully. Which of the following are related to a flood according to the passage?
a. heavy rain
b. global warming
c. low-lying land
d. the change of the river course
e. flat land
| A．a,b,e |
| B．c,d,e |
| C．a,c,e |
| D．b,d,e |
You are advised not to walk in the moving water because ___.
| A．it may make you fall over |
| B．you may step fish and kill them |
| C．you may drink polluted water |
| D．you may lose your shoes |
By saying “the water ALWAYS goes away”, the author means ___ .
| A．water can’t be stopped from flowing |
| B．you needn’t be afraid of floods |
| C．you should pay close attention to floods |
| D．it is common for floods to happen |
We can infer from the passage that during a flood ___.
| A．people are more likely to be attacked by animals |
| B．running away is a good way to save yourself |
| C．gas should be cut off |
| D．adults should persuade children to keep silent |
Strange stones of Costa Rica
One of the strangest mysteries in archaeology was discovered in the Diquis River Delta, in southern Costa Rica. Since the 1930s, hundreds of stone balls have been found. They range in size from a few centimeters to over two meters in diameter.
Who made these perfect spheres(球体) and how they made them remains a mystery. Some researchers believe the stones were made by extreme heating followed by cooling. People could have polished the spheres with sand or leather. The ancient Costa Ricans had no written language so there is no written record of just how they made the spheres.
Almost all are made of granite (花岗岩), a hard stone created by volcanoes. The granite quarries(采石场) were 25 to 30 miles away from the largest stones, which weigh more than 10 tons each. Nobody knows how people moved them.
Many of the stones have been found near the remains of houses or graves. Some believed that the stones contained hidden treasures and a few have been smashed but nothing has been found inside. Despite these losses, the National Museum of Costa Rica has recorded 130 spheres. However, many stones are not included because they have been removed from their original sites and used as ornaments(装饰) in homes, gardens and churches. Clearly, there are also many stones that lie undiscovered.The stones were discovered ___ .
| A．near the volcanoes |
| B．in southern Costa Rica |
| C．in a grave |
| D．in churches |
The writer ___ in the passage.
| A．admires the spheres very much |
| B．doesn’t believe the spheres were once made by humans |
| C．tells us a discovery |
| D．thinks highly of the spheres |
The underlined word “polished” refers to “___”.
| A．buried |
| B．wrapped |
| C．made shining |
| D．made big |
According to the passage, which of the following is true?
| A．The stone balls found in the Diquis River Delta are all very huge. |
| B．The stone balls were unearthed from the graves. |
| C．The local people show great interest in the stone balls. |
| D．There are a lot of treasures in the stone balls. |
The passage mainly tells us ___ .
| A．the stones are of great value. |
| B．the stones proved to be made by non-humans. |
| C．the stones are mystery. |
| D．the stone are ornaments. |
Many animal and plant species have become extinct and many more are in critical danger. Finding ways to protect the earth’s wildlife and protect the natural world they inhabit is now more important than ever.
Now many animals remain threatened with extinction as a result of human activity.
The dodo is a classic example of how humans caused damage to the earth’s wildlife. The flightless dodo was native to the Island of Mauritius in the Indian Ocean. It lived off fallen fruit from the island’s trees and lived safely until humans arrived in 1505. The easily controlled bird became a source of food for sailors and was attacked by animals introduced to the island by humans such as pigs and monkeys. The population of dodos rapidly decreased and the last one was killed in 1681.
The rhino(犀牛) horn is a highly prized item for Asian medicine. This has led to the animal being hunted in its natural habitat. Once widespread in Africa, Europe and Asia, most rhinos now live in protected natural parks and reserves. Their numbers have rapidly decreased in the last 50 years, and the animal remains constantly threatened by hunters.
The last 100years has seen a 95% reduction in the numbers of remaining tigers to between 5,000 and 7,000 and the Bali, Javan, and Daspian tigers are already extinct. The South China tiger is close to disappearing, with only 20 to 30 still alive. Like the rhino horn, tigers’ bones and organs are sought after for traditional Chinese medicine. These items are traded illegally along with tiger skins.
The World Wildlife Fund is actively involved in many areas of the world fighting to protect the natural habitats of endangered animals from further damage and curb the activities of hunters. Our own efforts at home and in the workplace can also make a difference. By reducing waste and pollution, saving water, wood, and energy, and reusing and recycling whenever possible, we can reduce the possibility of even more animals being lost, never to return.The purpose of this passage is to ___.
| A．call on us to protect the earth’s wildlife |
| B．let us know about the animal world |
| C．tell us many animals are in great danger |
| D．tell us why many animals are becoming extinct |
The common reason why many animals are facing extinction is that ___ .
| A．they are too easily controlled by humans |
| B．they can be made into highly prized medicine |
| C．they can provide people with delicious meal |
| D．humans kill them for their own interests |
Which of the following statements about the dodo is TRUE according to the passage?
| A．It was native to the Island of Mauritius and could fly very well. |
| B．It struggled to survive until human arrived in 1505. |
| C．Its population decreased only because pigs and monkeys were introduced. |
| D．It was possible for humans to find a dodo before 1681. |
The underlined word “curb” in the last paragraph is closest in meaning to “___”.
| A．improve |
| B．limit |
| C．cancel |
| D．criticize |
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