A team of scientists have studied thousands of species of birds to understand why there is so much diversity in the length of time they take to grow from a fertilized (受精的) egg into an independent adult. The study, published in Nature Communications, is the first one to consider the importance of lifestyle and environmental factors alongside evolutionary history and body size to explain the variation.
All organisms face a trade-off (交换) between reproducing and surviving and they solve this problem in different ways. The team found that migratory birds develop much quicker, which may ensure they are ready to return to their winter habitats at the end of each summer. Findings showed that birds that breed and live in safer environments with fewer predators typically took longer to develop, possibly because they can afford to spend longer since there is no danger or need to leave. They also found that bird species with a “live fast die young” strategy develop quicker, allowing them to maximize the number of offspring (后代) they can produce in the short time available. As expected, the research showed that bigger birds took longer to develop — but even among birds of a similar size there was variation in development times.
Dr. Chris Cooney, from the University of Sheffield’s Department of Animal and Plant Sciences and lead author of the research, said, “The amount of time it takes for a fertilized egg to develop into a fully grown adult varies hugely across the animal kingdom. For instance, it takes an elephant almost 10 years to reach independence, whereas a fruit fly is fully grown after only a matter of days. This extraordinary diversity is also prevalent within birds, where albatrosses (信天翁) can take almost a year to develop from an embryo (胚胎) to an independent adult, but a typical UK garden songbird (鸣禽) takes little more than a month. We found that certain aspects of a species’ lifestyle and environment are important in explaining how long they take to develop.”
The study on birds gives scientists some clues about the type of factors that may be important in other species. However, it may be that different factors are important for determining development length in other animal groups. Therefore, the next step is to address these questions using data that covers the whole scale of the animal kingdom — from fish to mammals to insects — to gain an even broader insight into the factors shaping these fundamental differences across species.
1. What does the study mainly focus on?| A．The number of bird species. | B．The changes of bird habitats. |
| C．The development length of birds. | D．The life span of birds. |
| A．Rare. | B．Common. | C．Special. | D．Strange. |
| A．The development times vary with the species. |
| B．Size determines the speed of birds’ development. |
| C．Animals living in the same place develop at the same rate. |
| D．Bigger animals always grow more slowly than smaller ones. |
| A．To study the cause of the species diversity. |
| B．To show the basic differences among species. |
| C．To explore the evolutionary history of animals. |
| D．To figure out other factors in development length. |
相似题推荐
【推荐1】Pigeons in London have a bad reputation. Some people call them flying rats. And many blame them for causing pollution with their droppings. But now the birds are being used to fight another kind of pollution in this city of 8.5 million.
“The problem for air pollution is that it’s been largely ignored as an issue for a long time,” says Andrea Lee, who works for the London-based environmental organization Client Earth. “People don’t realize how bad it is, and how it actually affects their health.” London’s poor air quality is linked to nearly 10,000 early deaths a year. Lee says, if people were better informed about the pollution they’re breathing, they could pressure the government to do something about it.
Nearby, on a windy hill in London’s Regent’s Park, an experiment is underway that could help — the first week of flights by the Pigeon Air Patrol. It all began when Pierre Duquesnoy, the director for DigitasLBi, a marketing firm, won a London Design Festival contest last year to show how a world problem could be solved using Twitter. Duquesnoy, from France, chose the problem of air pollution.
“Basically, I realized how important the problem was,” he says. “But also I realized that most of the people around me didn’t know anything about it. “Duquesnoy says he wants to better measure pollution, while at the same time making the results accessible to the public through Twitter.
“So,” he wondered, “how could we go across the city quickly collecting as much data as possible?” Drones were his first thought. But it’s illegal to fly them over London. “But pigeons can fly above London, right?” he says. “They live here — actually, they are Londoners as well. So, yeah, I thought about using pigeons equipped with mobile apps. And we can use not just street pigeons, but racing pigeons, because they fly pretty quickly and pretty low.”
So it might be time for Londoners to have more respect for their pigeons. The birds may just be helping to improve the quality of the city’s air.
1. What can we infer about London’s air quality from Paragraph 2?| A．Londoners are very satisfied with it. |
| B．The government is trying to improve it. |
| C．Londoners should pay more attention to it. |
| D．The government has done a lot to improve it. |
| A．Because they fly too high. |
| B．Because they are expensive. |
| C．Because they fly too quickly. |
| D．Because they are not allowed. |
| A．Clean air in London. |
| B．London’s dirty secret. |
| C．London’s new pollution fighter. |
| D．Causes of air pollution in London. |
【推荐2】I stole your dog today. No, I didn’t set a foot on your house, but from the condition of your dog, I can imagine what it looks like…the word “rubbish” comes to mind.
I found her along a road, with a heavy chain wrapped around her neck, still attached to rotten boards from her doghouse. Not only did I know that most of the town people had already ignored her, judging by where I found her, but I knew that if she had gotten into the Woods, the “cross” that she dragged behind her would have wrapped around a tree until starvation or thirst killed her. She has a beautiful name now. Already in the first week she has come to look more like she should. Her eyes sparkle and she has learned to wag her tail in greeting. She has stopped flinching (畏缩) when I make a sudden movement, because she knows now that I won’t beat her, in fact, she rarely leaves my side. She’s even become brave enough to bark at a cat and today I watched from the window as she attempted to play with the other dogs. No, it’s clear she does not miss you or her former life on a chain.
It’s not clear yet whether she’ll remain here or whether I’ll find her a loving home where she can count on more individual attention than I can give her, but one thing is certain, this is one bit of stolen “property” who is never returning to you. So sue me, accuse me, plead with the courts that she is rightfully yours ... I’m convinced this is the best “crime” I’ve ever committed. Hardly anything has pleased me more than the day I stole your dog. I need only look into her beautiful brown eyes to know that she’d defend my decision with her life. If we have one prayer, it is that you will not replace her, and if we have one special day to celebrate together, it is the day I stole your dog and the day she stole my heart.
1. What’s the author’s attitude towards the former owner of the dog?| A．Puzzled. | B．Angry. | C．Shocked. | D．Satisfied. |
| A．the dog is not lovely |
| B．the dog tried to find a kind master |
| C．the dog was treated badly by its former master |
| D．the author will be charged with stealing a dog |
| A．playing with other dogs |
| B．barking at a cat |
| C．not missing her former master |
| D．waving her tail to make greetings |
| A．He was afraid of being punished. |
| B．He thought he had to do it. |
| C．He believed that the law would allow him to do so. |
| D．He did it with pride. |
| A．To warn the people in the town not to keep dogs. |
| B．To prove his love to the dog to her former owner. |
| C．To explain to the police why the dog were in the Woods. |
| D．To ask people to find the dog a loving home and a owner who loves dogs. |
【推荐3】Last week, at a construction site near Austin, Texas, workers heard the cries of a puppy（小狗）. They went around the construction site trying to figure out where these cries were coming from. They figured the puppy was trapped somewhere. Then they realized it was actually coming from the sky. High above their heads, a puppy was flying through the air-in the claws of a hawk（鹰）. At that very moment, the bird suddenly let go and the tiny screaming puppy-no older than 6 weeks old-fell to them.
Aside from a few minor. wounds on his head, the puppy was surprisingly unhurt. The workers quickly brought him to a medical clinic, and from there, the puppy found his way into the care of the Austin Animal Center. "We don’t know where he came, from-whether he was born as a stray（流浪狗）or whether he was in a home and got out, ” Olohan, communications director for the Austin Animal Center, explains.
The paratrooper got a new name that came naturally: He would be called Tony Hawk. Considering his tininess-not much bigger than a mouse-Tony Hawk probably seemed like a good idea to a hungry hawk. Tony Hawk’s fears calmed down soon after he found himself on the ground, mostly because he found a foster home to ease him into his new life. In a month or so, he will be looking for a forever home.
Olohan thinks he won’t wait long. "We’ ve had plenty of interest, tons of applications for him,"she says. "He’s certainly not going to have a problem finding a home. "So a tiny puppy without a past found himself free from the claws-thanks to the warm, caring hands that will help him shape a brand-new future.
1. What happened to the little puppy?| A．He fell from a building. | B．He was caught by a hawk. |
| C．He was trapped somewhere. | D．He was seriously wounded. . |
| A．They took him to medical care. | B．They found a foster home for him. |
| C．They protected him from bird attack. | D．They got some information about his past. |
| A．A stray. | B．A mouse. | C．The hawk. | D．The puppy. |
| A．He is very fierce. | B．He will be adopted soon. |
| C．He has adapted to new life. | D．He faces a lot of problems. |
【推荐1】We’ve all been told that different types of fruits and vegetables have different benefits that help us maintain our health. A new international study has found that eating one fruit regularly can help reduce the risk of cancer, among those people who have a high risk of developing certain cancers.
The research which followed almost 1000 patients with Lynch syndrome-a genetic condition that makes people predisposed to orange of cancers found that a regular intake of resistant starch(抗酶解淀粉)could have a major preventative effect on the risk of cancer. Here’s what you need to know about how eating bananas can help reduce risk of cancer.
Resistant starch is a type of carbohydrate(碳水化合物)which feeds beneficial gut bacteria. It is found in green bananas. By eating green bananas your body gets a regular dose of resistant starch, which has been found to reduce risk of cancers in some parts of the body by more than half, according to the new research. The study, which was published in Cancer Prevention Research, was led by experts at the Universities of Newcastle and Leeds. It found that resistant starch, if taken regularly for an average of two years, had a positive effect on some cancers, which can be difficult to detect.
John Mather, a professor at Newcastle University explained:“Resistant starch acts in effect, like dietary fibre in your digestive system. This type of starch has several health benefits and fewer calories than regular starch.”
Besides green bananas, resistant starch is also found in foods such as peas, oats, cereal, beans and other starchy foods. You can also take resistant starch as a powder supplement.
In terms of bananas, experts recommend that eating one banana daily is the equivalent of one dose of resistant starch. The trick is to eat the bananas before they become too ripe or soft.
1. Which of the following can prevent the risk of cancer?| A．Carbohydrate. | B．resistant starch. |
| C．dietary fibre. | D．gut bacteria. |
| A．Eating green bananas regularly could serve as a power supplement. |
| B．Eating green bananas regularly could reduce risk of cancers. |
| C．Eating bananas regularly could improve life expectancy. |
| D．Green bananas would have fewer calories. |
| A．human nutrition. | B．plants formation. |
| C．herbal medicine. | D．weight control. |
| A．Take more green bananas. |
| B．Reduce calories and dietary fibre. |
| C．Keep regular intake of resistant starch. |
| D．Detect hidden cancers earlier. |
【推荐2】Even doctors agree that laughing makes your body and mind feel better. It seems that the act of smiling or laughing sends chemical messages to the brain and affects a person’s mood. Because they feel happier, they feel better. Stress is reduced and anger and tension begin to disappear. Your mind is at peace and so you feel happier and more able to cope with life’s problems.
Laughing and smiling also have the same effect on the body. They improve the body’s ability to stay fit and healthy because the person’s immune system is activated. This means that any germs (病菌) in the body are attacked and killed by these immune system cells. Some doctors even think that skin conditions, such as skin rashes (疹) which may be due to psychological factors, will improve if the person has a good laugh every day. Serious people may not live as long as people who take life less seriously. When you laugh, your muscles “contract” (收缩) and relax. This is not the case with very serious people. So a sense of humour is important for a good and healthy life and to remain a fit and strong person you need to laugh and smile for at least ten minutes every day!
1. What happens when we laugh?| A．Our muscles tighten and then relax. |
| B．We can’t think well and react quickly. |
| C．We can hardly breathe for a while. |
| D．Our skin reacts more sensitively. |
| A．Laughter can help you live longer. |
| B．Funny movies can help you with better breathing. |
| C．Jokes and humour can make you more decisive. |
| D．People with a good sense of humour don’t get heart diseases. |
| A．By exercising your muscles. |
| B．By improving your immune system. |
| C．By producing certain chemicals in your body. |
| D．By producing new cells. |
【推荐3】The text from my son said it all, “Dad, there’s an article you were born to write that the world is finally ready for: Bring Back the Handkerchief (手帕)!” As my son knows, there’s no “bring back” for me. For me, the handkerchief never left.
My mother raised me with several fixed rules. One was that a gentleman always has a clean handkerchief in his right rear pocket, a piece of simple cotton, roughly 15 inches square and less than four inches when folded. I was a dutiful son, but as a child, I had been wondering what it was there for. After 60 years, my body weight now feels wrong if I’m heading out of the house with an empty back pocket.
I am sure this habit has sometimes struck friends but in polite company nobody comments on somebody else’s business. Children like my kids think of my hankie ridiculously old-fashioned and they have their arguments. If you have to be prepared every day for allergies or a cold, why not choose a little packet of tissues (纸巾), which saves you from that disgusting business of blowing your nose in the thing and then stuffing it back in your pants?
I understand their point. But a handkerchief is more durable and has a far wider variety of uses. Can you grab the handle of a pot that’s boiling over with a Tempo tissue? Or do you recall the cases of skinned knees and drippy noses that hankie wiped? In fact, my wife gave me several new handkerchiefs as gifts. Neither of us can count the number of times she wiped her tears at a movie, or, as it happens, she’s needed to blow her nose.
Yet not even my mother could have predicted the hankie’s new role as an Essential Public Health Appliance. All of us have learnt how hard it is to follow advice from medical experts about not touching your face. Here is an answer. Use your hankie. In case of emergency, your handkerchief can become a makeshift DIY mask that can be pulled over your lower face like a robber entering a bank.
And it will certainly give me the chance to lift my chin and look at my adult children through one eye, asking in her good-hearted way, “What do you have to say now, smarty-pants?”
1. What kind of person is the author in the eye of his son?| A．His father is a born writer. |
| B．His father lost his handkerchief long ago. |
| C．His father will bring back the handkerchief. |
| D．His father has a habit of using handkerchief. |
| A．They like it very much. | B．They regard it as fashionable. |
| C．They consider it inconvenient. | D．They desire to have it someday. |
| A．The function of handkerchiefs has been updated. |
| B．Handkerchiefs will be taken over by tissues sooner or later. |
| C．The author’s wife feels embarrassed to give him a handkerchief. |
| D．The author was made fun of by his friends for his use of handkerchiefs. |
| A．Bossy. | B．Humorous. | C．Serious. | D．Critical. |
【推荐1】Fashion house Alabama Chanin has a new line of organic cotton clothing made from its own cotton field. It’s not just an experiment in keeping production local but also an attempt to bring back to life the tradition of clothes-making in the Deep South.
Alabama Chanin, the fashion and lifestyle company founded by Natalie Chanin and Billy Reid, is best known for her flowing, made-to-order organic garments (衣服), entirely hand-made and inspired by the rural South of the 1930s and ‘40s’. “It’s not just ‘factory work’,” Chanin says. “This is a skill that’s dying out in this country. ” “It’s part of the nation’s ‘cultural sustainability to preserve these things’,” Chanin says, “to be able to make our clothes.”
Her business partner, K. P. McNeill, is the one who first thought about growing their own cotton. The ideas of going from field to garment made Chanin think of how generations ago, manufacturing was of a vertical (纵向的) affair. Could that be done today? And organically? They came up with a plan to test it. Reid says it meant no artificial chemicals. “A lot of the weeds had to be pulled by hand. It’s not just your normal cotton operation that’s automated,” Reid says.
Chanin holds a piece of ivory-colored cloth made from the hand-picked cotton grown in the Alabama field. “I’ve never seen cotton quite as clean and clear as this,” Chanin says, “I don’t think people have seen that since cotton was really a driving factor of destruction in this country.”
Chanin says this project is about transforming cotton into something more modern. “I mean, cotton has an ugly history. It has built fortunes, it’s destroyed nations, it’s enslaved people,” says Chanin. “But to me this cotton is part of making a new story for cotton.”
1. What do we know about Alabama Chanin?| A．It just focuses on the ready-made suits. |
| B．It preserves traditional craftsmanship. |
| C．It leads the way in the fashion industry. |
| D．It ensures sustainable economic growth. |
| A．To highlight production efficiency. |
| B．To question the cotton’s cleanliness. |
| C．To contrast cotton’s historical image. |
| D．To praise the cotton of high quality. |
| A．Fashion keeps changing all the time. |
| B．A bad reputation often ruins tradition. |
| C．Honoring the past builds the future. |
| D．Modernization easily beats tradition. |
| A．From Cotton Field to Garment |
| B．Creating Clothes That Do Matter |
| C．From Old Times to Modern Days |
| D．Launching a Fashion Movement |
【推荐2】Selfdriving cars are so popular that the University of Michigan has even established a town called Mcity to allow car manufacturers to safely test their autonomous cars.
While Mcity can be used to simulate(模拟) many reallife road conditions，it cannot help test gestures drivers use to communicate their intention to other drivers，pedestrians or cyclists.To find a solution，US car manufacturer Ford，with researchers from Virginia Tech，firstly considered using text as a way to communicate the car’s intention，but decided it would probably not work universally.The option of using symbols was also discarded，because research shows that a majority of people do not have a good understanding of what they mean.
Finally，the researchers settled on light signals.A white light warned that there were no humans in the car.A slow blinking one indicated that the car was coming to a stop，while a rapidly flashing light cautioned passersby that the car was about to accelerate.
Then came the big challenge—testing the signals on real road.“We needed to try out this new lighting to communicate the intention of the vehicle，but if you’ve got a driver behind the seat，you still have natural communication between humans，” said Andy Shaudt，who led the Virginia Tech research team.“So we needed to make it look like a driverless car.”
The team designed a car seat costume(服装) that the driver would wear to cover his or her face and upper body.Of course，the drivers could see very clearly.The researchers then equipped the car with cameras to capture human reactions to a light bar on the windshield(挡风玻璃)，which flashed one of the three signals when appropriate.Six drivers，all keeping their hands low on the wheel so as not to be detected，took turns to test driving the car through the busy streets.
The overall reaction to the flashing lights was very encouraging.Who knew costumes could be useful for more than Halloween?
1. What did the team first consider using as a way to communicate the car’s intention?| A．Light. | B．Language. |
| C．Symbols. | D．Sound. |
| A．Symbols. | B．Drivers. |
| C．Researchers. | D．Flashes. |
| A．amuse the drivers |
| B．attract the pedestrians |
| C．warn the cyclists |
| D．confuse the people |
【推荐3】“How do they walk in these things?” complains Jack Lemmon, walking with difficulty in his heels, newly dressed as his another identity Josephine, in the film “Some Like It Hot”.
High heels were, in fact, originally designed for men — and had an extremely practical purpose. Soldiers on horseback wore them in 10th-century Persia, according to Elizabeth Semmel hack of the Bata Shoe Museum in Toronto. The heel helped keep them stable as they stood up in their stirrups ( 马镫) and took aim at enemies with bows and arrows (cowboy boots still use heels in this way). Over time, heels appeared on the shoes of male nobles across Europe. Yet from the mid-17th century, heels became associated with supposedly “feminine” qualities, and so became women’s wear. Until the mid-20th century heels were heavy, heavy things. After the Second World War, techniques and materials used in aircraft engineering were applied to shoes, creating the stiletto ( 细高跟). The high, narrow heel requires a thin metal pole, strong enough to bear the wearer’s weight yet flexible enough to allow the shoe to move.
Shoemakers have searched actively for a right heel. They aim to reduce the angle created by a high heel, which forces the few square centimeteres of the ball of your foot to bear the entire weight of your body. Joan Oloff, a podiatrist-turned-shoe-designer, makes footwear lined with memory foam ( 泡沫) to absorb the shock of each painful step. The bottom part of the shoe is crafted to support the arch of the foot and distribute the wearer’s weight more equally. Antonia Saint Dunbar, an entrepreneur, makes shoes with a heel cup and strips inside to stop the foot slipping around and getting blisters ( 水泡). And growing numbers of companies make shoes with adjustable heels: two inches for the boardroom, four for the nightclub, none for home.
However, the wisest are stepping down altogether: in 2016, for the first time, more British women bought trainers than heels.
1. Why is a scene in “Some Like It Hot” mentioned in Paragraph 1?| A．To recommend this film. |
| B．To explain Jack’s double identity. |
| C．To introduce the topic of high heels. |
| D．To stress the difficulty of walking in heels. |
| A．By presenting research findings. |
| B．By analyzing cause and effect. |
| C．By following the order of time. |
| D．By following the order of importance. |
| A．To keep soldiers fighting on horseback steady. |
| B．To keep cowboys standing up in stirrups safe. |
| C．To show off the beauty of women. |
| D．To show the nobility of Europeans. |
| A．Popularize shoes with adjustable heels. |
| B．Help women find the right high heels. |
| C．Encourage women to wear trainers. |
| D．Make high heels comfortable. |
【推荐1】Apple Store
Description
Tap the Apple Store app on your iPhone or iPod touch, and you can do all things Apple.Buy Apple products and accessories(配件) and read customer reviews. Add free laser engraving and choose signature gift wrap on select products to make your items even more special. Find Apple Retail Stores, reserve select Apple products for pickup at your favorite store, and request help when you are at the store. Schedule Genius Bar and One to One reservations and check in for them when you arrive.
The Apple Store app is also the easiest way to buy or reserve your new iPhone --- right from your current iPhone. You can do it in just a few taps, without entering your AT & T account information. Order your new iPhone from the Apple Online Store and it’s shipped to you free and ready to use. Or reserve your new iPhone, pick it up at an Apple Retail Store, and we’ll set it up for you in minutes.
Apple Online Store Features
•Explore new and featured products from Apple.
•Buy a new iPhone and other Apple products, accessories, and software.
•Add free personal engraving to any new iPad or iPod.
•Choose signature gift wrapping for any iPad or iPod, select Mac notebooks, and select Apple software and accessories.
•Read customer reviews and get answers to product questions.
Apple Retail Store Features
•Reserve iPhone and other select products for pick up.
•Request help, check in for reservations, and receive meet-up alerts when you are at a store(iOS 4 required).
•Make Genius Bar and One to One reservations.
•Sign up for workshops and events.
What’s New in Version 1.1
•Add engraving and gift wrapping to select purchases from the Apple Online Store.
•Reserve products for pickup at an Apple Retail Store.
•Check in for reservations and request help within stores(iOS 4 required).
•Add Apple Retail Store reservations directly to iCal.
Please note: With Location Services on and the Apple Store app open, Apple will use your location to identify nearby Apple Retail Stores and to offer additional services when you are in a store. If you have previously selected the Apple Store app using location but do not want this new feature, you can update your Location Services preferences in General Settings.
1. The text is intended to ______.| A．recommend a new product of Apple | B．inform the readers of Apple Store |
| C．describe the function of Apple Store | D．offer additional services to customers of Apple Store |
| A．buy Apple products only | B．get to any Apple Retail Store |
| C．reserve iPhone products for pickup | D．request help wherever you are |
| A．Reserve your new iPhone without entering your AT & T account information. |
| B．Order your new iPhone and it’s shipped to you free and ready to use. |
| C．Reserve your new iPhone and pick it up at an Apple Retail Store conveniently. |
| D．Check in for reservations, and received meet-up alerts when you are at a store. |
Sochi Volunteers
1. Sochi 2014 Volunteer Training Program was launched on ．
| A．30 May 2013 | B．11 March 2013 |
| C．16 December 2013 | D．19 September 2013 |
| A．Sochi | B．St． Petersburg |
| C．the United Kingdom | D．Moscow |
| A．The 25 ,000 volunteers were from Russia． |
| B．Winners of Cultural Program Competition weren't known until 19 September 2013． |
| C．From August,25 to September,8,you were able to enjoy Winter Games in Sochi． |
| D．Few of the cultural activities were intended for creating atmosphere of Sochi Winter Games． |
| A．importance | B．place | C．date | D．name |
【推荐3】Buying books on the Internet is a great way to save time and money. Online bookstores offer new books and used books that can save you lots of money. They are far better compared to traditional bookstores as they offer much wider kinds of books. Another advantage of buying books online is that you can also read the book reviews as well as readers’ reviews to get an idea whether the book is worth buying. Online bookstores offer great discounts to regular customers which is a big attraction for book lovers.
For book lovers, the most important thing is to get books on time. Therefore, you need to find a reliable online bookstore that will be able to provide fast deliveries (送货).
Here are some tips to use when choosing an online bookstore. Some online bookstores are popular for fiction books; some are for non-fiction books or novels, etc. Understanding their specialization will help you get the right kind of books in time. Check whether you will be buying the books from a third-party seller or directly from the website. Although the website could be reputable (声誉好的), third-party sellers advertised on their site may not have a good reputation. Never jump at stores that offer super cheap prices, as books sold at such low prices could be in very bad condition.
Most of the popular online bookstores offer useful tools. One tool is a wish list tool on its website. You can update (更新) the list of books you wish to buy in the future. The bookstore will know what you want and will e-mail you immediately when the book of your choice is available.
1. Why was online bookstores much better than traditional ones?| A．They offer the latest books. |
| B．They offer more kinds of books to choose from. |
| C．They offer the lowest prices. |
| D．They offer readers more about their favorite authors. |
| A．The speed of deliveries. | B．The author of books. |
| C．The prices of books. | D．The condition of books. |
| A．How to advertise on the website to get a good reputation. |
| B．How to avoid buying bad condition books online. |
| C．How to understand the specialization of an online bookstore. |
| D．How to choose a reliable online bookstore. |
| A．You may get the right kind of books. |
| B．You may buy the book you want as quickly as possible. |
| C．You may know more reliable booksellers. |
| D．You may pay for the book at a low price. |
