英语 热门试卷

Few Americans stay in one place for a lifetime. We bd_blank from the city to the suburbs, from high school to college in a different state, from a job in one region to a better job _, from the home where we _ our children to the home where we plan to live in _. With each move we are bd_blank making new friends, who become part of our new life.

For many of us the bd_blank is a special time for forming new friendships. Today, millions of Americans go on vocation _, and they go not only to see new sights but also -- in those places where they do not feel too _-- with the hope of meeting new people. No one really bd_blank a vacation trip to produce a close friend, but the beginning of a friendship is possible. Surely in every country people bd_blank friendship.

ZiyThe word “friend” to American people can be _ to a wide range of relationships -- to someone one has known for a few weeks in a new place, to a close business companion, to a childhood playmate, to a man or woman, to a _ colleague. There are real bd_blank among these relations for Americans -- a friendship may be _, casual, situational or deep and lasting. But to a European, who sees only our surface behavior, the differences are not clear.

As Europeans see it, all kinds of “friends” flow bd_blank of Americans' homes with little ceremony. They may be parents of the children's friends, house guests of neighbors, members of a committee, business associates from another town or even another country. bd_blank as a guest into an American home, the European visitor finds no _ differences. The atmosphere is bd_blank. Most people, old and young, are called bd_blank first names. Americans’ characteristic openness to different styles of relationship makes it possible for us to find new friends abroad with whom we feel bd_blank.

【语篇导读】本文是一篇说明文。作者美国人的一种生活方式。他们喜欢到处旅行，结交新朋友。

Two thieves came to a house to steal something. They dug a hole in the wall of the house. There lived many mice in the house. The woman in the moonlight saw a mouse crawl into the house.“Look！In comes one，”she said to the man in the house. The thief was so frightened that he hurriedly crawled out of the house and said to the one waiting outside，“She found me when I was just in.” But the thief outside didn’t believe him，so he said，“Let us two try to crawl into the house together.”At that time two mice happened to crawl into the house，too. The woman saw the mice and shouted，“In come two，catch them！” The two thieves were terribly frightened. The man in the house said，“You saw them come in but where are they？ I will catch them tonight.”The two thieves started running away at once.

The two thieves wanted to make it clear whether they had been found or not the night before. The next day they acted as men selling sweet potatoes and came before the house. The man and the woman were ploughing in their fields.

The rein（缰绳）broke and the woman came home for a rope. She saw two men selling sweet potatoes

and wanted to buy some. She picked out two which looked like mice. At the time the man couldn’t wait for her any longer in the fields and he ran back from the fields to hurry her up. The woman showed the sweet potatoes to the man and said，“How they look like the two of last night.”The man said，“I asked you to fetch a rope，why don’t you hurry for it？”The two thieves ran away quickly without their sweet potatoes.

【语篇导读】本文是一篇记叙文。作者讲述了两个窃贼到一个农妇家里偷东西的事情。在入室时，农妇夫妇看到老鼠进到屋里，窃贼以为发现自己，逃走。第二天想要知道是否真被发现，推着红薯在农妇家门口叫卖，农妇买红薯过程中窃贼以为自己被发现，又弃车逃走。

The relationship between exercise and cancer has long both intrigued and puzzled oncologists and exercise physiologists.

Exercise is strongly associated with lowered risks for many types of cancer. At the same time, exercise involves biological stress, which typically leads to a short-term increase in inflammation（发炎）which can contribute to higher risks for many cancers.

Now, a new study in mice may offer some clues into the exercise-cancer paradox. It suggests that exercise may change how the immune system deals with cancer by boosting adrenaline（肾上腺素）, certain immune cells and other chemicals that, together, can reduce the severity of cancer or fight it off altogether.

To try to better understand how exercise can both elevate inflammation and simultaneously protect the body against cancer, scientists at the University of Copenhagen in Denmark and other institutions decided to closely examine what happens inside mice at high risk for the disease.

So, for the new study, they began by gathering a group of adult lab mice. These animals generally like to run.

The scientists then implanted melanoma (黑素瘤) skin cancer cells into the mice before providing half of them with running wheels in their cages while the other animals remained sedentary. After four weeks, far fewer of the runners had developed full-blown melanoma than the sedentary mice and those that had been diagnosed with the disease showed fewer and smaller lesions.

They drew blood from both the exercising and sedentary animals and cells from any tumors in both groups. As expected, they found much higher levels of the hormone adrenaline in the blood of the exercising animals, especially right after they had been working out on the wheels but also at other times of the day. The body releases adrenaline in response to almost any type of stressful experience, including exercise.

They also found higher levels of interleukin-6 in the blood of the runners. This is a substance that is released by working muscles and is believed to both increase and decrease inflammation in the body, depending on where and how it goes to work.

Perhaps most important, they found much higher numbers in the bloodstreams of runners than in the sedentary mice of a type of immune cell named natural killer cells that are known to be strong cancer fighters.

So the scientists repeated their original experiment multiple times, inducing cancer while allowing some mice to run and others to sit. In some of these follow-up experiments, the scientists injected the runners with a substance that blocked the production of adrenaline and gave sedentary animals large doses of added adrenaline.

What they now found was that when running mice could not produce adrenaline, they developed cancer at the same rate as the sedentary animals, while the sedentary animals that had been injected with extra adrenaline fought off their tumors better than other sitting mice.

More remarkably, the scientists determined that adrenaline seemed to be sending biochemical signals to some of the animals’ IL-6 cells, making them physiologically more alert, so that when a tumor began to develop in the affected animal, those IL-6 cells in turn activated the natural killer cells in the bloodstream and actually directed them to the tumors, like minute guide fish.

With these results, “we show that voluntary wheel running in mice can reduce the growth of tumors, and we have identified an exercise-dependent mobilization of natural killer cells as the underlying cause of this protection,” said Pernille Hojman, a researcher at the University of Copenhagen who oversaw the new study. It perhaps provides one more incentive for us to get up and move.

【语篇导读】本文是一篇说明文。作者讲述了运动和癌症之间的关系困惑着肿瘤学家和运动生理学者，讲述了两者的关联。

A new argument has been put forward as to whether penguins are disturbed by the presence of tourists in Antarctica.

Previous research by scientists from Keil University in Germany monitored Adelie penguins and noted that the birds’ heart rates increased dramatically at the sight of a human as far as 30 meters away. But new research using an artificial egg, which is equipped to measure heart rates, disputes this. Scientists from the Scott Polar Research Institute at Cambridge say that a slow moving human who does not approach the nest too closely, is not viewed as a threat by penguins.

The earlier findings have been used to partly explain the 20 per cent drop in populations of certain types of penguins near tourist sites. However, tour operators have continued to insist that their activities do not adversely affect wildlife in Antarctica, saying they encourage non-disruptive behavior in tourists, and that the decline in penguin numbers is caused by other factors.

Amanda Nimon of the Scott Polar Research Institute spent three southern hemisphere summers at Cuverville Island in Antarctica studying penguin behavior towards humans. “A nesting penguin will react very differently to a person rapidly and closely approaching the nest,” says Nimon. “First they exhibit large and prolonged(延长) heart rate changes and then they often flee the nest leaving it open for predators (掠夺者) to fly in and remove eggs or chicks.” The artificial egg, specially for the project, monitored both the parent who had been ‘disturbed’ when the egg was placed in the nest and the other parent as they both took it in turns to guard the nest.

However, Boris Culik, who monitored the Adelie penguins, believes that Nimon’s findings do not invalidate his own research. He points out that species behave differently – and Nimon’s work was with Gentoo penguins. Nimon and her colleagues believe that Culik’s research was methodologically flawed（使无效） because the monitoring of penguins’ responses needed capturing and restraining（控制） the birds and fitting them with heart-rate transmitters. Therefore, argues Nimon, it would not be surprising if they became stressed on seeing a human subsequently.

【语篇导读】本文是一篇议论文。作者论述了企鹅是否会受到游客的干扰。专家指出，不靠近企鹅窝的观光不会对企鹅造成干扰，而靠近游客的企鹅区域企鹅数量的减少，是其他因素造成的。这引起大家争议。

India now leads the world in smartphone growth. It saw a 55% increase in the number of smartphones in 2014. The number of Web users increased by 37 %. Smartphones were the source of 65 % of its Internet traffic and 41 % of its e-commerce, according to a report by the analyst Mary Meeker, titled “Internet Trends 2015”.

India’s Internet boom has started. Within three or four years, almost every adult in India will own a smartphone. They will be used to order goods, read news, monitor crop growth and so on.

Indan adults will be very interested in these devices just as young Americans are. 87 % of Americans between the ages of 18 and 34 who own smartphones say they never separate from these: “My smartphone never leaves my side.” Four out of five say that the first thing they do on waking is to reach for their smartphones. And three fifths believe that in the next five years everything will be done on mobile devices.

In the business world, the rise of mobile platforms is dramatically transforming many industries all over the world. What Indian software developers have to do is to start thinking about solutions to old problems by using all the features of these new devices. They need to take advantage of the unique properties of smartphones and tablets. As Indian software developers and enterprises master the smartphone, they will be able to export their solutions to the rest of the world.

This will make possible a new tech revolution that is greater than what created India’s IT industry in the 1980s and 1990s. We can expect the rapid transformation of India when a billion people become connected and have equal access to information and services.

【语篇导读】本文是一篇说明文。作者讲述了在印度智能手机得到迅猛发展的原因、现状。

Online shopping is coming into fashion in most cities, where people are able to make full useof the rapidly-developed internet technology. Nowadays, can we find a person bd_blank hasn’t experienced online shopping? Definitely not.

Online shopping _ (welcome) by most people due to various reasons. From the perspective of

consumers, it can save some time for people who don’t have much spare time. Just click the mouse,

they can get _ they want while staying at home. For the retailers, it can custom costs for those who don’t have enough circulating funds. _ (compare) with the traditional trade mode, they

don’t have to spend money in renting a house. _, there are still some disadvantages in online

shopping. First, a face-to-face deal makes online shopping less reliable and trustworthy. Second, people

will lose _ fun of bargain.

__is undeniable that shopping on the internet has become an irresistible trend in modern society. It’s_great urgency that we need to make the relative laws_the rapid growth of online

shopping. Only in this way can we enjoy the pleasure and_ (convenient) of online shopping

without the concern of being cheated.

【语篇导读】本文是一篇说明文。作者讲述了网购的现状。