Natural leaves are able to change sunlight and water into energy. It is known as photosynthesis (光合作用).Now researchers have found a way to imitate this seemingly simple process.
The artificial leaf developed by Daniel Nocera and his colleagues at MIT can be seen as a special silicon chip with catalysts (催化剂).Similar to natural leaves,it can split water into hydrogen and oxygen when put into a bucket of water. The hydrogen and oxygen gases are then stored in a fuel cell,which uses those two materials to produce electricity,located either on top of a house or beside the house.
Though the leaf is only about the shape of a poker card,scientists claimed that it is promising to be an inexpensive source of electricity in developing countries. “One can imagine villages in India and Africa not long from now purchasing an affordable basic power system based on this technology,” said Nocera at a conference of the American Chemical Society.
The artificial leaf is not a new idea. The first artificial leaf was invented in 1997 but was too expensive and unstable for practical use. The new leaf,by contrast,is made of cheap materials,easy to use and highly stable. In laboratory studies,Nocera showed that an artificial leaf prototype (原型) could operate continuously for at least 45 hours without a drop in activity.
The wonderful improvements come from Nocera's recent discovery of several powerful,new and inexpensive catalysts. These catalysts make the energy transformation inside the leaf more efficient with water and sunlight. Right now,the new leaf is about 10 times more efficient at carrying out photosynthesis than a natural one. Besides,the device can run in whatever water is available;that is,it doesn't need pure water. This is important for some countries that don't have access to pure water.
With the goal to “make each home its own power station” and “give energy to the poor”,scientists believe that the new technology could be widely used in developing countries,especially in India and rural China.
1. Which of the following orders correctly shows how the artificial leaf is used to produce electricity?
a.artificial leaves split water into hydrogen and oxygen
b.the hydrogen and oxygen gases are stored in a fuel cell
c.the artificial leaves are put in water
d.the fuel cell uses hydrogen and oxygen to produce electricity
A.c,a,b,d | B.c,b,a,d |
C.b,c,a,d | D.c,a,d,b |
A.build up more power stations in the world |
B.provide cheaper energy for developing countries |
C.offer people in developing countries access to pure water |
D.gain a deeper understanding of the photosynthesis process |
A.an introduction to the history of artificial leaves |
B.a mixture of water power and solar energy |
C.giving energy to the poor |
D.an invention copying photosynthesis |
相似题推荐
【推荐1】Maintaining good health doesn’t happen by accident.
A healthy diet is rich in fiber, whole grains, fresh fruits and vegetables, and omega-3 fatty acids (不饱和脂肪酸). These dietary components turn down inflammation (炎症), which can damage tissue, joints, and organs.
Finally, establish a good relationship with a primary care physician. A primary care physician is a healthcare professional who helps you manage your health. He or she is the first person you talk to when you have any medical problem that is not an emergency. If something happens to your health, a physician you know-and who knows you-is in the best position to help.
A.Omega-3 fatty acids are of vital importance. |
B.Physical activity is also necessary for good health. |
C.Talking to trusted family members and friends can help a lot. |
D.Going easy on processed foods is another element of healthy eating. |
E.It requires smart lifestyle choices, workout and the occasional checkup and test. |
F.He or she will also recommend tests to check for hidden cancer or other conditions. |
G.Only a few lifestyle choices have as large an impact on your health as physical activity. |
【推荐2】Mice were given a memory test in a lab at the University of New South Wales, in Australia. Scientist Margaret Morris set them in their usual box, but she rearranged the objects in the box. Some mice smelled them curiously, but others just moved on. They didn’t remember the objects were once in a different place.
The mice with sharper memory were fed with a regular diet of low-fat, healthy food. However, the mice that ate lots of junk food for two weeks – such as cake, meat pies, chips, and cookies – were forgetful.
Food can have the same effect on people, too. “If you’re eating junk food regularly, and not eating enough fruit and vegetables,” Morris said, “the changes inside your body may be affecting brain function” Changes inside the body can affect a person’s overall health, too.
Scientists have long known that the brain communicates with the stomach to control digestion. Recently, they have found that the stomach talks back. It may even tell the brain what to do.
Foods with too much salt and sugar affect the microbiome (肠道菌群) in your body by killing the right bacteria (细菌) in it. These bacteria protect you from illness and keep your mind sharp. Lacking them can lead to being overweight and depression.
Rob Knight is a scientist at the University of California, San Diego. He suggests eating yogurt, because it is packed with healthy bacteria. Does that mean no French fries? “Having them sometimes is okay,” Knight says. “It’s the long-term habits that really matter. Being good to your microbiome over the next six months is a lot more important than what you ate yesterday, or what you eat tomorrow.”
1. In the memory test, some mice moved on because ______.A.they are forgetful | B.they eat a lot of food |
C.they are not curious | D.they eat low-fat food |
A.the stomach may speak to brain | B.the stomach may affect brain function |
C.the stomach can keep one’s mind sharp | D.the stomach can protect one from illness |
A.microbiome | B.bacteria |
C.too much salt and sugar | D.yogurt |
A.People must not eat French fries to protect their mircobiomes. |
B.Eating yogurt for six month is good for body health. |
C.It’s necessary to maintain long-term healthy eating habits. |
D.What you eat tomorrow is the most important thing. |
【推荐3】University of Colorado Boulder researchers have developed a new tool that could lead to more efficient and cheaper technologies for capturing (捕获) heat-trapping gases from the atmosphere and turning them into beneficial substances, like fuel or building materials, meanwhile limiting global warming and avoiding disastrous impacts of global climate change.
The tool predicts how strong the bond will be between carbon dioxide and the molecule (分子) that traps it. It allows researchers to identify suitable molecular candidates to capture carbon dioxide from everyday air.
The goal of carbon capture and storage technology is to remove carbon dioxide from the atmosphere and store it safely for thousands of years. But while it has been in use in the USA since the 1970s, it currently captures and stores a mere 0.1% of global carbon emission (排放) annually. To help meet the goal of carbon emission laid out by the IPCC, carbon capture and storage would have to rapidly increase in scale by 2050.
Current industrial facilities around the world rely on capturing carbon dioxide from a concentrated source, such as emissions from power plants. While these methods can bind (凝结) a lot of carbon dioxide quickly and efficiently using large amounts of certain chemical binders, they are also extraordinarily energy- intensive. This method is also quite expensive at scale to take carbon dioxide and turn it into something else useful, such as carbonates, according to Luca, fellow-elect of the Renewable and Sustainable Energy Institute (RASEI). Using the tool would free carbon capture facilities from being tied to concentrated source, allowing them to exist almost anywhere.
Being able to easily estimate the strength of chemical bonds also enables researchers to identify which binders will be best suited and offer a cheaper alternative to the traditional method for capturing and converting carbon into materials or fuel according to Haley Petersen, co-lead author of the study.
1. What can the new tool be used to do?A.Stop climate change. | B.Capture oxygen from air. |
C.Help deal with climatic issues. | D.Divide the molecule of carbon. |
A.The atmosphere. | B.The material from carbon. |
C.The goal of carbon emission. | D.The carbon capture and storage technology. |
A.Its disadvantages. | B.Its functions. |
C.Its working principle. | D.Its practical application. |
A.Art. | B.Science. | C.Fashion. | D.Culture. |
【推荐1】In ancient China, people created 24 solar terms (节气) to help with farming. At present, it still helps Chinese farmers. Of all these solar terms, Major Snow (大雪) is the 21st. During Major Snow, the snow is heavy and the temperature drops. Let’s learn more about it.
Snowy winter
The snow in the north sometimes lasts a whole day. The world turns white. “A snow year, a rich year.” As the snow covers the ground, the low temperature kills some pests (害虫). It is good for farmers to grow.
Playing with snow
In northern China, people usually go skating at the park or make snowmen. It is a popular activity to play with snow. Even if the weather is cold and icy, they still have fun.
Eating mutton
Mutton is the best choice for people. It tastes great and is good for the body. People in north like to have mutton soup with their family and friends.
Eating porridge
Hot porridge could make people warm in cold weather. In China, it’s a tradition to eat red bean porridge in Major Snow. It’s also a symbol of being together and keeping away from bad luck.
1. How many solar terms are there in a year?A.24. | B.21. | C.12. | D.4. |
A.hot | B.cold | C.dry | D.warm |
A.雪落有晴天 | B.冬雪回暖迟 | C.瑞雪兆丰年 | D.雪多雨水多 |
A.kill some pests | B.play with snow |
C.have mutton soup | D.eat red bean porridge |
A.The 21st solar term is Major Snow. | B.The heavy snow sometimes lasts a whole day. |
C.Mutton is good for the body. | D.People usually go skating in southern China. |
【推荐2】If you are a poem lover, there is great possibility that you know few women poets, which is not your fault but less public report of them than male ones. Here are two great figures.
Gwendolyn Brooks is one of the most influential and widely read 20th-century American poets. The author of more than 20 books, she was highly regarded even during her lifetime and had the distinction of being the first Black poet to win the Pulitzer Prize. She was also the first Black woman to hold the role of Consultant in Poetry to the Library of Congress, a position now referred to as the Poet Laureate Consultant in Poetry, and served as the Illinois poet laureate for 32 years. Her body of work gave her, according to critic George E. Kent, “a unique position in American letters. Not only has she combined a strong commitment to racial identity and equality with a mastery of poetic techniques, but she has also managed to bridge the gap between the academic poets of her generation in the 1940s and the young Black militant writers of the 1960s.”
Annie Finch is a poet, translator, cultural critic, and performance artist. She is the author of seven volumes of poetry, including Earth Days: Poems, Chants, and Spellsin Five Directions (Nirala Publications, 2023); Eve (Story Line Press, 1997) and Calendars (Tupelo Press, 2003), both finalists for the National Poetry Series; Spells: New and Selected Poems and The Poetry Witch Little Book of Spells (2019) from Wesleyan University Press; and the verse play Among the Goddesses: An Epic Libretto in Seven Dreams (Red Hen Press, 2010), winner of the Saraswati Award. Finch’s work has appeared in The Penguin Book of Twentieth-Century American Poetry (2011) and The Norton Anthology of World Literature and has been translated into eight languages.
1. According to the author, women poets are less known because of ________.A.their lower productivity | B.the lack of exposure in the media |
C.their poor social status | D.the gender inequality |
A.Her commitment to poet writing. | B.Being the first black winner of the Pulitzer Prize |
C.Her great poetic techniques | D.Her contributions to many aspects besides writing. |
A.Annie Finch is a successful poet because she wrote more than others. |
B.Annie Finch is a productive poet because she could do other jobs. |
C.Annie Finch is an ambitious poet because she did more than writing. |
D.Annie Finch is a super poet because she had many poems public. |
【推荐3】Older brothers provide protections for their younger siblings (兄弟姐妹), but they might also be damaging their education, a new study suggests.
French scientists have discovered that the language ability of children falls two months behind for under-sixes who have an older brother, but not those who have an older sister. The researchers guess that older sisters are far more willing to talk to their younger siblings than brothers to make up for their parents’ being less available now. Older sisters may also compete less than older brothers for parental attention.
To find out, scientists followed a group of 1000 children from birth to five-a-half years old and evaluated their language skills at two years old, three years old and at the end of the study, measuring vocabulary, syntax (句法) and verbal reasoning. On average, first-borns and those with older sisters performed best.
Explaining the phenomenon, Dr Naomi Havron of the Ecole Normale Superieure in Paris said, “We generally believe that first-borns often have better language ability because their parents often supply them with one-on-one quality time, when they talk about things that interest them, tell them stories, etc.”
“But it is possible that older sisters are more likely to interact with their younger siblings than older brothers, and thus provide their own input. Also, it is possible that girls are less damaging than boys, and are thus in less of a competition for parents’ time and attention.”
The researchers said parents should try and make time to talk to their children to help develop their language skills. Dr Haivron added, “Encourage your children to have positive interactions between themselves, for example by encouraging them to play a game that they both like together.”
1. According to the new study, who has a weaker language ability?A.A boy with a younger brother. | B.A boy with an older sister. |
C.A girl with an older brother. | D.A girl with an older sister. |
A.Girls are more competitive. | B.Boys are more troublesome. |
C.Girls damage their siblings. | D.Boys care for their siblings. |
A.some advice | B.a summary |
C.another example | D.the writer’s attitude |
A.A book review. | B.An education magazine. |
C.A medical paper. | D.A science report. |
【推荐1】For the 17 years my life was very happy. Then the first sad thing happened. My mother became very ill, and soon she knew that she was dying. Just before she died, she asked Elizabeth and me to go to her room. She held our hands and said, “Victor and Elizabeth, my children, I’m very happy because you love each other, and because one day you’ll get married. Everyone in the family loves you, Elizabeth. Will you take my place in the family, my dear? I can die happy if you look after them when I have gone.”
My mother died and we were very sad, because we loved her dearly. Elizabeth was brave and helped us; her sweet smile gave us some happiness in the unhappy days after my mother’s death. The time came for me to go to university. I didn’t want to leave my sad family, but we all knew that I should go. It was hard to leave, too, because the parents of my good friend Henry would not let him go to university with me. So I had gone alone.
On my first day at university I met my teacher, Professor Waldman, who was one of the greatest scientists in the world. He gave a wonderful talk to all the students who were starting at the university. He ended his talk by saying, “Some of you will become the greatest scientists of tomorrow. You must study hard and discover everything that you can. This is why God made you intelligent—to help other people.”
After the professor’s talk, I thought very carefully. I remembered the storm when I was 15; I remembered how the lightning had destroyed the tree. From then on, I wanted to use electricity to help people, and I wanted to discover the secrets of life. I decided to work on these two things.
I started to work the next day. I worked very hard and soon Professor Waldman and I realized that I could learn to be a very good scientist.
The professor helped me very much, and other important scientists who were his friends helped me, too. I was interested in my work and I did not take one day’s holiday during the next two years, I did not go home, and my letters to my family were very short.
After two years, I had discovered many things and I built a scientific machine that was the best in the university. My machine would help me answer the most important question of all. How does life begin? Is it possible to put life into dead things? To answer these questions about life I had to learn first about death. I had to watch bodies from the moment when they died and the warm life left them. In the hospital and in the university, I watched the dying and the dead. Day after day, month after month, I followed death, so it was a dark and terrible time.
I built a tall mast about 150 meters high, which is higher than the tallest building in the city, to catch lightning and send the electricity down to my machine in the lab. I believed I could use that electricity to give life to things that were dead.
Then one day, the answer came to me. Suddenly I was sure that I knew the secret of life.
1. Which of the following is TRUE according to the passage?A.Victor did not want to leave his family because his mother died not long before. |
B.Elizabeth married shortly after Victor’s mother died. |
C.Elizabeth was a brave girl who loved Victor and gave him much help. |
D.Victor’s mother was very angry when she knew he loved Elizabeth. |
A.he discovered many things and built a scientific machine |
B.he learnt much about death both in the hospitals and in the university |
C.he built a tall mast to catch lightning and send the electricity down to the lab |
D.he worked hard and took only one day’s holiday during the next two years |
A.use electricity to cure diseases |
B.build the best machine to learn about death |
C.become the greatest scientist of tomorrow |
D.give life to things that were dead by using electricity |
① Victor’s mother passed away.
② Victor got help from the professor and other scientists.
③ Victor went to university and attended the professor’s talk.
④ Victor found the answer to giving life to things that were dead.
⑤ Victor experienced a storm, seeing the lightning destroying the tree.
A.①②③④⑤ | B.⑤①③②④ | C.①③②⑤④ | D.⑤①②④③ |
【推荐2】When other nine-year-old kids were playing games, she was working at a petrol station. When other teens were studying or going out, she struggled to find a place to sleep on the street. But she overcame these terrible setbacks (挫折) to win a highly competitive scholarship and gain entry to Harvard University. And her amazing story has inspired a movie, “Homeless to Harvard: The Liz Murray Story”, shown in late April.
Liz Murray, a 22-year-old American girl, has been writing a real-life story of willpower and determination. Liz grew up in the shadow of two drug-addicted parents. There was never enough food or warm clothes in the house. Liz was the only member of the family who had a job. Her mother had AIDS and died when Liz was just 15 years old. The effect of that loss became a turning point in her life. Connecting the environment in which she had grown up with how her mother had died, she decided to do something about it.
Liz went back to school. She threw herself into her studies, never telling her teachers that she was homeless. At night, she lived on the streets. “What drove me to live on had something to do with understanding, by understanding that there was a whole other way of being. I had only experienced a small part of the society,” she wrote in her book Breaking Night.
She admitted that she used envy to drive herself on. She used the benefits that come easily to others, such as a safe living environment, to encourage herself that “next to nothing could hold me down”. She finished high school in just two years and won a full scholarship to study at Harvard University. But Liz decided to leave her top university a couple of months earlier this year in order to take care of her father, who has also developed AIDS. “I love my parents so much. They are drug addicts. But I never forget that they love me all the time.”
Liz wants moviegoers to come away with the idea that changing your life is “as simple as making a decision”.
1. The main idea of the passage is ________.A.how Liz managed to enter Harvard University |
B.how Liz struggled to change her life |
C.why Liz loved her parents so much |
D.the hard time Liz had in her childhood |
a. Her mother died of AIDS.
b. She worked at a petrol station.
c. She got admitted into Harvard.
d. The movie about her life was put on.
e. She had trouble finding a place to sleep.
A.b, e, a, d, c | B.a, b, c, e, d | C.e, d, b, a, c | D.b, a, e, c, d |
A.Both Liz’s father and mother are AIDS-infected patients. |
B.Liz lived a hard time in her childhood. |
C.Liz’s story is an inspiration to many people. |
D.Liz hated her father because he got addicted to drugs. |
A.Envy and encouragement. | B.Willpower and determination. |
C.Decisions and understanding. | D.Love and respect for her parents. |
【推荐3】Seventy years ago, in the city of Boston, there lived a small girl who had the naughty habit of running away. On a certain April morning, almost as soon as her mother finished buttoning her dress, Louisa May Alcott slid out of the house and up the street as fast as her feet could carry her.
It was a beautiful day, and she did not care so very much just where she went so long as she was having an adventure, all by herself. Suddenly she came upon some children who said they were going to a nice, tall ash heap to play. They asked her to join them. Louisa thought they were fine playmates, for when she grew hungry they shared some cold potatoes and bread crusts with her.
When she was tired of the ash heap she said goodbye to the children, thanked them for their kindness, and hop-skipped to the Common, where she must have wandered about for hours. All of a sudden, it began to grow dark. Then she wanted to get home. It frightened her when she could not find any street that looked natural. She was hungry and tired, too. She threw herself down on some door-steps to rest and to watch the lamplighter, for you must remember this was long before there was any gas or electricity in Boston. At this moment a big dog came along. He kissed her face and hands and then sat down beside her with a sober look in his eyes. Poor tired Louisa leaned against his neck and was fast asleep in no time. The dog kept very still. He did not want to wake her.
Pretty soon the town crier went by. He was ringing a bell and reading in a loud voice, from a paper in his hand, the description of a lost child. You see, Louisa's father and mother had missed her early in the forenoon and had looked for her in every place they could think of. Each hour they grew more worried, and at dusk they decided to hire this man to search the city.
When the runaway woke up and heard what the man was shouting— "Lost— Lost— A little girl, six years old, in a pink skirt, white hat, and new, green shoes" —she called out in the darkness, "Why— that's ME!" The town crier took Louisa by the hand and led her home, where you may be sure she was welcomed with joy.
1. The reason why Louisa thought the children were very nice playmates was that .A.they had been good friends | B.they asked her to play with them |
C.they shared with her some food | D.they all liked taking adventures |
A.A street performer. | B.A milkman. | C.A news reader. | D.A policeman. |
① Louisa couldn't find the way back home.
②Louisa returned home safe and sound.
③Louisa ran away and slid into the street one morning.
④Louisa came across some children in the street.
⑤The town crier searched the street for Louisa.
A.③④①⑤② | B.③①⑤④② | C.⑤②①④③ | D.⑤②④①③ |
【推荐1】WHEN JANE AUSTEN’S first novel Sense and Sensibility was published in 1811, the title page simply read. ‘A Novel. In Three Volumes. By a Lady’. What could be greater justice than the fact that on her 200th death anniversary, that same anonymous lady gets her very own bank note? Austen is only the third writer to grace an English note (following William Shakespeare and Charles Dickens) and the first woman writer to do so. And really, no one can be unhappy with the honour.
When Austen died at 41, on June 18th, 1817, her profession as a writer did not make it to her epitaph. Her brother Henry chose instead to focus on her ‘charity, devotion, faith and purity’. While she never got to embrace the title of an author when she was alive, death has ensured her legacy. Her books have been translated into 40 languages and Pride and Prejudice itself has sold over 20 million copies. If her epitaph were to be written today, we could, perhaps, borrow from Virginia Woolf who wrote in The TLS of 1913, “More than any other novelist she fills every inch of her canvas with observation, fills every sentence with meaning, stuffs up every chink of the fabric until each novel is a little living world, from which you cannot break off a scene or even a sentence without bleeding it of some of its life. Her characters are so lively and vivid that they have the power to move out of the scenes in which she placed them into other moods and circumstances.”
The greatness of Austen is not only that she created the standard example of the modern novel, but that she continues to be relevant. Her novels have been endlessly adapted and modified because they still make sense today, because they can explain current sensibilities. Her characters can easily move out of London or Pemberley or Mansfield Park and be placed in Delhi or Shanghai or Beijing. Indianise the names, and we can all create our own comedy of manners. Mrs Bennet, the mimsy busybody, could easily be Mrs Batra, your Punjabi neighbour with an axe to grind and daughters to wed. Emma Woodhouse, the self-absorbed, privileged young lady could be Aisha of south Bombay, whose artifice overwhelms her potential. Mr Darcy could be your Mr Dasgupta, the dignified Bengali bachelor whose silence will be misunderstood as snobbery.
A fascinating study of Austen’s novels in facts, figures and charts published in The Guardian brings to light the world she knew and the only world she wrote about. All her characters(in her six novels) are independently wealthy who have no professions. Balls and picnics feature in all of her books. Evenings and afternoons are spent playing cards. And if romance is the base of her novels, then elopement is also a must. The servants speak no lines. The only historic event of the time that gets a mention is the Napoleonic War(1803-1815). The Industrial Revolution and French Revolution are not mentioned at all. The lovers will marry by the end.
Even if the plots of her six novels are simple enough, the success of Austen is her singular wit. It is a cleverness born from immediate observation but one which is universal in nature. She says it well in Northanger Abbey. ‘The person, be it gentleman or lady, who has not pleasure in a good novel, must be extremely stupid.’
Two hundred years after her death, you have to be a fool to not enjoy her novels.
1. What can we learn from the fact that Jane Austen’s photo on the English bank note?A.To honor her publishing the first novel Sense and Sensibility. |
B.To honor the most well-known writer in English literature. |
C.To honor her outstanding contributions to English literature. |
D.To show no one can envy her for her success. |
A.Jane Austen was also fond of painting on the canvas. |
B.Jane Austen lived in her own little world. |
C.Jane Austen’s works possess superb writing techniques. |
D.Jane Austen’s characters can move out of scenes magically. |
A.Her major characters have no professions, so life is hard for them. |
B.Jane Austen’s works are mainly based on her own living experiences. |
C.Life is casual and colorful for characters in her works. |
D.Few historic events are mentioned in her works. |
A.To laugh at those who don’t enjoy Jane Austin’s works. |
B.To introduce Jane Austin’s main works. |
C.To analyse Jane Austin’s writing technique. |
D.To honor Jane Austin as an evergreen storyteller. |
【推荐2】Penguin Fun Clubs are found on campsites throughout Europe. They offer a range of enjoyable activities for children aged 4—14 years and we pride ourselves on delivering exciting times that children love and parents trust. Our fun-packed clubs are located throughout France, Spain, Italy, Germany and the UK, where our fame for high quality childcare depends on the professionalism and hard work of our on-camp staff.
In all our clubs we offer a varied timetable packed with exciting activities.
We are looking for enthusiastic and caring young adults to work in our camps for all or part of the coming Summer season.
Why work for Penguin Fun Clubs?
• Penguin Fun Clubs offer full in-house training by our experienced training team,including a course in basic first aid.
• You will meet and work with like-minded individuals.
• We will pay expenses to cover your return journey to the campsite where you are based.
• You will be given accommodation and food throughout your time at the camp.
• You will be given a fixed amount of pocket money each week (amount depending on age and the country in which you are based).
• You will gain valuable experience for any future career, especially one which involves working with children.
• We are flexible if you’re only able to work for part of the season.
• Impress us on camp and there's the opportunity to work with us for many seasons to come.
• We run Penguin Fun Clubs throughout the summer from July to September.
Job description
As a Penguin Fun Club helper you will work with small groups of children supervising them in a range of structured activities and using equipment provided by the camp. (There is plenty of opportunity to think up your own activities for your group.) Clubs will run in the mornings from 10.00 to 12.30 and in the evenings from 17.00 to 19.00. All Penguin Fun Club helpers will work for six days a week. In your free time you will have full access to all the campsite facilities.
Penguin Fun Club helpers should show enthusiasm at all times and encourage maximum participation in the activities from the children with whom they are working.
Requirements
All applicants:
• must be over 16 years of age
• should have an interest in/previous experience of working with children
• have some knowledge of the language of the country in which they wish to work
• be enthusiastic and organised with excellent communication skills and a good sense of initiative
• work well in a team with other like-minded individuals
1. The passage is aimed to__________.A.introduce the job opportunities Penguin Fun Clubs will offer |
B.promote Penguin Fun Clubs as a great place of entertainment for kids |
C.look for those interested in helping Penguin Fun Clubs this summer |
D.recommend the exciting activities that Penguin Fun Clubs provide |
A.be able to work from July through September |
B.pay for the transportation to and from the club |
C.find a place near the club to live in the summer |
D.talk in the language of the country where they work |
A.Work just 30 hours a week. | B.Use all campsite facilities. |
C.Get a full-day outdoor training. | D.Design entertainment equipment for kids. |
【推荐3】When early humans killed a mammoth, how did they keep the meat before they could eat it all? We don’t know; maybe they didn’t. But perhaps they preserved their mammoth steaks in salt. However, it is hard to know for sure. We do know for certain that by 3,000 years ago, the Babylonians, Egyptians, and Chinese were all experts at salting. They used salt to preserve food.
For thousands of years, salting was a common way to preserve food. But for a long time, no one knew why salt worked. Then, in the 1800s, a Frenchman named Louis Pasteur discovered the secret: bacteria. What does salt have to do with bacteria? First, bacteria need moisture to grow and multiply. Salt pulls moisture out of food, so the bacteria no longer have enough moisture. Besides, salt is poisonous to many bacteria. If you cover food with salt, bacteria outside the food die before they get in, and bacteria already in the food are poisoned by the salt.
So how do you preserve food with salt? For meat or fish, you pour on a layer of salt, then rub it in well. Hams are often made this way. Another way is to alternate layers of food and salt in a big container. The salt will draw the moisture out of the food, creating a brine that the food sits in. You’ll need to make sure the brine completely covers the food; any food left exposed to the air will spoil. If you preserve cabbage this way, you’ll make sauerkraut.
How well salt preserves food depends on how much is used. The more salt, the longer the food is preserved. Unfortunately, using enough salt to preserve food for a very long time can cause problems. It can make food tough. It can destroy flavor. And, of course, it can make the food too salty to eat, which is harmful to our health.
Today, even though we no longer rely on salt to keep our food fresh, we haven’t lost our taste for salt. We don’t want to give up our bacon, salami, and watermelon pickles!
1. Why are examples of the ancient people mentioned in the first paragraph?A.To make an introduction to the topic. |
B.To explain our ancestors were very clever. |
C.To tell us the ancient people had a lot of food to eat. |
D.To show the ancient people were good at preserving food. |
A.If you want to make a ham, you should keep it in a brine. |
B.If you want to make sauerkraut, you’d better pour on a layer of salt and rub it. |
C.To keep our food longer, you should put as much salt on the food as possible. |
D.People needn’t give up salty food completely as long as they control the amount. |
A.To explain how the ancient people preserve food. |
B.To tell us how salt works in preserving food. |
C.To persuade people to give up salty food. |
D.To introduce the way of preserving food with salt. |