The days when a cellphone was used for nothing beyond calling and texting are gone. Today, we turn smart phones into magical machines with apps that transform them into musical instruments or business machines or video players. But it turns out that we are only searching the surface. Who knew that smart phones would make pretty good satellites?{#blank#}1{#/blank#}

Smart phones forecast the weather

      Networking expert Open Signal has discovered something interesting: the sensors in Android phones designed to measure battery  temperature, light, pressure and 80 on can be used to generate surprisingly accurate weather reports. {#blank#}2{#/blank#}

Smart phones save the rainforests

       Detecting illegal logging(盗伐) may sound like a novel app, {#blank#}3{#/blank#}: in Indonesia, the non-profit organization Rainforest Connection' wants to use donated Android phones to detect illegal logging. As Newscientist reports, “The phonesare equipped with solar panels specifically designed to take advantage of the brief periods when light reaches the forest floor. Their microphones stay on at all time, and the software listens for the sound of a chainsaw(链锯).”

{#blank#}4{#/blank#}

        Researchers at the university of Illinois have developed an iPhones app that turns the phone into a fully featured mobile medical lab that uses the phone's camera to detect proteins, bacteria, viruses and other organisms.

Smart phones drive cars

        Google's self-driving cars carry around  $30,000 ofhigh-tech hardware and sensors, but students at Australia's Griffith University think they can get the job done with asingle smart phone.{#blank#}5{#/blank#}

A. but it's a serious business.

B. Here are someuses for smart phones the makers probably didn't imagine.

C. so it can beused to detect the sound of a chainsaw.

D. It has been used in many fields.

E. Get enough phones involved and you will have a weather sensing network.

F. Smart phones serve as mobile medical labs.

G. They have built a model that relies mainly on the phone's camera and built—in GPS.

    Recently some American scientists have given a useful piece of advice to people in industrialized nations．They say people should eat more of the same kind of food eaten by humans living more than 10,000 years ago．{#blank#}1{#/blank#}

    The scientists say that the human life has changed greatly．Our bodies have not been able to deal with these changes in lifestyle and this had led to new kinds of sicknesses．{#blank#}2{#/blank#}So they are called "diseases of civilization"．Many cancers and diseases of the blood system are examples of such diseases.

    Scientists noted that people in both the Old Stone Age and the New Stone Age enjoyed very little alcohol or tobacco, probably none．{#blank#}3{#/blank#} However, a change in food is one of the main differences between life in ancient times and that of today.

 Stone Age people hunted wild animals for their meat, which had much less fat than domestic ones．They ate a lot of fresh wild vegetables and fruits．They did not have milk or any other dairy products, and they made very little use of grains．{#blank#}4{#/blank#} We eat six times more salt than our ancestors．We eat more sugar．We eat twice as much fat but only one third as much protein and much less vitamin C.

    {#blank#}5{#/blank#} But scientists say that we would be much healthier if we eat much the same way the ancient people did, cutting the amount of fatty, salty and sweet food.

 A．Modern people used to suffer from "diseases of civilization".

 B．People today probably don't want to live like our ancestors.

 C．These new sicknesses were not known in ancient times.

 D．Ancient people also got lots of physical exercise.

 E．In that case, they would live much healthier.

 F．But today, we enjoy eating a lot of these.

 G．Stone Age people lived a simple life.

C

    FLORENCE, Italy—Svetlana Cojochru feels hurt. The Moldovan has lived here seven years as a caregiver to Italian kids and the elderly, but in order to stay she's had to prove her language skills by taking a test which requires her to write a postcard to an imaginary friend and answer a fictional job ad.

    Italy is the latest Western European country trying to control a growing immigrant(移民) population by demanding language skills in exchange for work permits, or in some cases, citizenship.

    Some immigrant advocates worry that as hard financial times make it more difficult for natives to keep jobs, such measures will become more a vehicle for intolerance than integration(融合). Others say it's only natural that newcomers learn the language of their host nation, seeing it as a condition to ensure they can contribute to society.

    Other European countries laid down a similar requirement for immigrants, and some terms are even tougher. The governments argue that this will help foreigners better join the society and promote understanding across cultures.

    Italy, which has a much weaker tradition of immigration, has witnessed a sharp increase in immigration in recent years. In 1990, immigrants numbered some 1.14 million out of Italy's then 56.7 million people, or about 2 percent. At the start of this year, foreigners living in Italy amounted to 4.56 million of a total population of 60.6 million, or 7.5 percent, with immigrants' children accounting for an even larger percentage of births in Italy.

    Cojochru, the Moldovan caregiver, hoped obtaining permanent residence(居住权) would help her bring her two children to Italy; they live with her sister in Moldova, where salaries are among the lowest in Europe. She was skeptical that the language requirement would encourage integration.

    Italians always “see me as a foreigner,” an outsider, even though she's stayed in the country for years and can speak the local language fluently, she said.

    Before you begin studying English, ask yourself one question: “ {#blank#}1{#/blank#} ” Is it because you want to, or because someone else wants you to? Like every decision in life, studying English must be something you want to do. Here are some tips to help you learn English well.

●Set goals.

    If you know why you want to study, setting goals is easy. For example, maybe you want to travel to an English-speaking country. Great! {#blank#}2{#/blank#} Perhaps you have already known many useful phrases, but you want to improve your listening skills and pronunciation. Whatever your goals are, you should write them down,

●{#blank#}3{#/blank#}

    How long do you need to study to achieve your goals? This answer is different for every student. {#blank#}4{#/blank#} If you work 40 hours per week，don't plan on spending another {#blank#}5{#/blank#} hours a week studying English. Start off slow, but study regularly. Use material that is challenging, but not too difficult. Find out what works for you. After you have studied for a few weeks, adjust your study schedule accordingly.

●Make a commitment.

    Learning English requires a lot of motivation. Nobody is going to take your attendance when you aren't in class. If you are sure that you are ready to begin studying, make a commitment.

●Have fun learning English.

    If you aren't having fun learning English, you're not studying the right way! You can be a serious student who has fun at the same time. Make up your own reward program to give yourself encouragement to stay on a task.

A. Make an arrangement.

B. Why do I want to study English?

C. Your goal might be to learn “Survival English”.

D. The important thing is to be realistic and reliable.

E. What is the most effective way of learning English?

F. The things we do best in life are what we enjoy doing.

G. Make every moment of your English learning meaningful.

    In 2017, AlphaGo defeated Chinese player Ke Jie to become the world's No 1, ending thousands of years of human dominance（控制）in the game. AlphaGo is an artificial intelligence（AI）Go-playing program{#blank#}1{#/blank#}

    Artificial intelligence（AI）is usually defined as the science of marking computers do things that require intelligence when done by humans.{#blank#}2{#/blank#}These include learning, reasoning, problem-solving, perception, and language-understanding.

    {#blank#}3{#/blank#}In fact we are increasingly depending. upon computer-based artificial intelligence. As Charlie Qrtiz said, head of AL at the Massachusetts-based software company Nuance Communication, “It has opened a window for us.”Smartphones, self-driving cars, intelligent robots，etc. are constantly coming into our life. According to a recent survey, half of the world's AI experts believe human level machine intelligence will be achieved by 2040. This will open up huge possibilities for the enrichment of mankind, from tackling climate change and treating disease to labour- saving devices.

    {#blank#}4{#/blank#}Physicist Stephen Hawking last year warned that unless we take care, board games might be the least of it. “The development of full artificial intelligence could mean the end of the human race.”{#blank#}5{#/blank#}They believe AlphaGo's victory is a reminder of how fast the world is overcoming the obstacles in the way of AI, and its distribution in the world about us. Although there may yet be no evidence that computers will ever shake off their human masters, we should still treat these development with the humility and caution they deserve.

A. Other scientists have also expressed the concern.

B. Artificial intelligence has both advantages and disadvantages.

C. Defeating a human Go master is not the only thing AI can do.

D. Artificial intelligence will bring us disasters instead of benefits.

E. It was designed by an American Artificial intelligence company.

F. Not all experts hold the optimistic attitudes to the development of AI.

G. Research in AI has so far focused on some special fields of intelligence.

    Scientists recently discovered three tyrannosaur (霸王龙) trackways in Canada. The trackways suggest the meat eaters traveled and hunted in groups. The 70-million-year- old footprints are the first tyrannosaur trackways ever found.

    Tyrannosaurs were a type of meat-eating dinosaur that included the strong Tyrannosaurus rex and Albertosaurus. “Groups of tyrannosaurs may have stuck together as a group to increase their chances of bringing down animals and individually surviving,” study coauthor Richard McCrea says. He works for Canada's Peace Region Paleontology Research Centre. It's believed that tyrannosaurs were solitary creatures. The newly discovered trackways could change the way scientists look at these frightening beasts.

    Trackways can uncover a lot about the social behavior of a species. Unfortunately, very few tyrannosaur footprints have ever been found, and until recently, the only ones known were single prints discovered in Mongolia, the western U.S., and western Canada. But in October 2011, a hunting guide named Aaron Fredlund found two tyrannosaur track marks near Tumbler Ridge, an area in the foothills of the Canadian Rockies. Over the next year, McCrea and his team searched the site and found the remaining trackways.

    The footprints are at about the same depth, which suggests the tyrannosaurs moved through the area at the same time. Impressions of the dinosaurs' rough skin are even visible in the prints. The prints are also in near-perfect condition. That's because the ground had a high clay (黏土 ) content when the dinosaurs walked through the area. The land was later covered by a thick layer of volcanic ash, which kept the marks intact (完整). "This is the most ideal situation you could ask for," McCrea says.

    Researchers aren't sure of the exact species of tyrannosaur that left the prints. But the historic findings show a great deal about how the beasts moved and behaved. “We have extremely convincing evidence that tyrannosaurs traveled in groups,” says McCrea. "This is probably the most important evidence to come out to date on that topic."