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题型:阅读理解 题类:真题 难易度:困难

2019年高考英语真题试卷(天津卷)

阅读理解

    How does an ecosystem(生态系统)work? What makes the populations of different species the way they are? Why are there so many flies and so few wolves? To find an answer, scientists have built mathematical models of food webs, noting who eats whom and how much each one eats.

    With such models, scientists have found out some key principles operating in food webs. Most food webs, for instance, consist of many weak links rather than a few strong ones. When a predator(掠食动物)always eats huge numbers of a single prey(猎物), the two species are strongly linked; when a predator lives on various species, they are weakly linked. Food webs may be dominated by many weak links because that arrangement is more stable over the long term. If a predator can eat several species, it can survive the extinction(灭绝)of one of them. And if a predator can move on to another species that is easier to find when a prey species becomes rare, the switch allows the original prey to recover. The weak links may thus keep species from driving one another to extinction.

Mathematical models have also revealed that food webs may be unstable, where small changes of top predators can lead to big effects throughout entire ecosystems. In the 1960s, scientists proposed that predators at the top of a food web had a surprising amount of control over the size of populations of other species—including species they did not directly attack.

    And unplanned human activities have proved the idea of top-down control by top predators to be true. In the ocean, we fished for top predators such as cod on an industrial scale, while on land, we killed off large predators such as wolves. These actions have greatly affected the ecological balance.

    Scientists have built an early-warning system based on mathematical models. Ideally, the system would tell us when to adapt human activities that are pushing an ecosystem toward a breakdown or would even allow us to pull an ecosystem back from the borderline. Prevention is key, scientists says because once ecosystems pass their tipping point(临界点), it is remarkably difficult for them to return.

(1)、What have scientists discovered with the help of mathematical models of food webs?
A、The living habits of species in food webs. B、The rules governing food webs of the ecosystems. C、The approaches to studying the species in the ecosystems. D、The differences between weak and strong links in food webs.
(2)、A strong link is found between two species when a predator______.
A、has a wide food choice B、can easily find new prey C、sticks to one prey species D、can quickly move to another place
(3)、What will happen if the populations of top predators in a food web greatly decline?
A、The prey species they directly attack will die out. B、The species they indirectly attack will turn into top predators. C、The living environment of other species will remain unchanged. D、The populations of other species will experience unexpected changes.
(4)、What conclusion can be drawn from the examples in Paragraph 4?
A、Uncontrolled human activities greatly upset ecosystems. B、Rapid economic development threatens animal habitats. C、Species of commercial value dominate other species. D、Industrial activities help keep food webs stable.
(5)、How does an early-warning system help us maintain the ecological balance?
A、By getting illegal practices under control. B、By stopping us from killing large predators. C、By bringing the broken-down ecosystems back to normal. D、By signaling the urgent need for taking preventive action.
举一反三
阅读理解

    If Confucius(孔子)were still alive today and could celebrate his September 28 birthday with a big cake, there would be a lot of candles. He'd need a fan or a strong wind to help him put them out.

    While many people in China will remember Confucius on his special day, few people in the United States will give him a passing thought. It's nothing personal.  Most Americans don't even remember the birthdays of their own national heroes.

    But this doesn't mean that Americans don't care about Confucius. In many ways he has become a bridge that foreigners must cross if they want to reach a deeper understanding of China.

In the past two decades, the Chinese studies programs have gained huge popularity in Western universities. More recently, the Chinese government has set up Confucius Institutes in more than 80 countries. These schools teach both Chinese language and culture. The main courses of Chinese culture usually included Chinese art, history and philosophy(哲学). Some social scientists suggest that Westerners should take advantages of the ancient Chinese wisdom to make up for the drawbacks of Westerners philosophy.  Students in the United States, at the same time, are racing to learn Chinese.  So they will be ready for life in a world where China is an equal power with the United States.

    Businessmen who hope to make money in China are reading books about Confucius to understand their Chinese customers. 

    So the old thinker's ideas are still alive and well.

    Today China attracts the West more than ever, and it will need more teachers to introduce Confucius and Chinese culture to the West.

    As for the old thinker, he will not soon be forgotten by people in the West, even if his birthday is.

阅读理解

    After years of heated debate, gray wolves were reintroduced to Yellowstone National Park. Fourteen wolves were caught in Canada and transported to the park. By last year, the Yellowstone wolf population had grown to more than 170 wolves.

    Gray wolves once were seen here and there in the Yellowstone area and much of the continental United States, but they were gradually displaced by human development. By the 1920s, wolves had practically disappeared from the Yellowstone area. They went farther north into the deep forests of Canada, where there were fewer humans around.

    The disappearance of the wolves had many unexpected results. Deer and elk populations — major food sources (来源) for the wolf – grew rapidly. These animals consumed large amounts of vegetation (植被), which reduced plant diversity in the park. In the absence of wolves, coyote populations also grew quickly. The coyotes killed a large percentage of the park's red foxes, and completely drove away the park's beavers.

    As early as 1966, biologists asked the government to consider reintroducing wolves to Yellowstone Park. They hoped that wolves would be able to control the elk and coyote problems. Many farmers opposed the plan because they feared that wolves would kill their farm animals or pets.

    The government spent nearly 30 years coming up with a plan to reintroduce the wolvers. The U.S. Fish and Wildlife Service carefully monitors and manages the wolf packs in Yellowstone. Today, the debate continues over how well the gray wolf is fitting in at Yellowstone .Elk, deer, and coyote populations are down, while beavers and red fores have made a comeback. The Yellowstone wolf project has been a valuable experiment to help biologists decide whether to reintroduce wolves to other parts of the country as well.

阅读理解

    For those who may not be familiar, there is no such thing as a bicycle grants(补助金). As a matter of fact, there are a number of organizations and programs offering bicycle grants to bicyclers all over the world. Now of course, you can't simply receive money, because you want to buy a new mountain bike. Usually, those awarded grants are working on improving the quality of life. People are excited about the bicycle grants. This type of influence and achievement is gaining the attention of various companies that want to help by providing the necessary funding.

Eastman Kodak Company

    Kodak has developed a fund called the “Kodak American Greenways Awards". They are cooperating with the National geographic Society and the Conservation fund. Each year, they present grants as high as $2,500. The “seed” grant award is awarded to organizations that focus on improving blue ways, greenways, natural areas, and trails.

    US Government

    The government has developed their only program for bicycle riders, called" The US Department of transportation's Recreational Trails Program". The government's program is primarily focused on funding trail projects. The benefits of the fund is recreation, which includes bicycling, hiking, in-line skating, snowmobiling, all-terrain(地面)vehicle riding, and so forth. The great addition to the fund is that they distribute the funding to all the states. This means that everybody has the opportunity of receiving bicycle grants.

    Bikes Belong Coalition

    The Bikes Belong Coalition makes putting more people on bicycles their priority. They advocate for a better environment, recreation, sports, and better health, by way of bicycling. At the same time, they provide funding for supporting projects and bicycle facilities. Some of the projects they accept are paved lanes and bike paths. Applications for their grants can be submitted by either a facility class or a supporting class. Also, Bikes Belong Coalition are not quick to award bicycle grants to those who have been awarded in the past 3 years. This is partially due to their limited amount of funding

阅读理解

    Language learning apps are very popular now and offer opportunities to learn vocabulary and practice grammar. But there has been a discussion about just how effective such apps can be.

    Among the most popular apps are Duolingo and Busuu. A previous research found positive results on the use of them. But it mainly concentrates on studies with learners who had signed up for language courses and these apps worked as an after-class support, so the results were not always reliable. A recent study of 4,095 Busuu users has been carried out to find out if users can actually learn a language with an app.

    Busuu provides learning materials for 12 different languages. It offers special models where some contents are available for free while some contents are not, We find that its users are an even mix of men and women. More than half consider themselves to be at the beginner level as there is a decrease in users as their language levels go up. Most people use the app because of personal interest, or because they want to study or live abroad. Females tend to use it less often but for longer periods of time than male users.

    Getting any feedback on Busuu depends on whether your answer is correct or not. While it is helpful, this is not the sort of feedback language teachers prefer, as it does not explain why the answer is right or wrong. In spite of this, feedback in the app is very highly rated.

    More than 92% of the people state that the app has met their expectations and 86% consider the app as very good or good. In fact, more than 80% of the users surveyed strongly agree that using the app has helped them improve their knowledge of the language they are learning.

    Besides, language learning apps also create an environment where mistakes are only known to the users, and this can address the performance anxiety that many learners suffer from when asked to speak a foreign language. So language teachers should encourage their students to use them to do the grammar work, leaving precious class time for more language communication.

阅读理解

Imagine turning on the GPS and seeing an image of your car from above. As the car drives, the map follows along in real time, informing you of any traffic, pedestrians, animals or other things nearby. Routes and names of road appear over the live stream. It's like the map has come to life.

This type of map isn't available yet. But it could be very soon. In 2014, the WorldView-3 satellite was sent into space. Even though it orbits Earth at more than 370 miles (600km) away, it can take images of objects on Earth that are just 10 inches (25cm) across. Looking all the way from outer space, it can make out a smart phone held in your hand. It can tell what types of cars are travelling down a road. But it can't identify your face or read the cars' license plate numbers.

According to some reports, this satellite and other US satellites have the technology to take even sharper images, with a resolution of up to around 4 inches (10cm). But US law forbids making these super-sharp pictures public. But the idea that anybody might be able to spy on the entire Earth in such detail may seem scary. Live, high-detail satellite mapping could be used to keep tabs on anybody at any time, without the person's knowledge. Ray Purdy of University College London told CNN that he couldn't imagine what this could mean for privacy. "Most satellites are commercially owned, so if you have money, you can have that imagery. It means anyone can spy on anyone." he said.

At the same time, live, detailed maps of the Earth's surface could aid humanity in amazing ways. Satellite images can help experts track storms as they form and chart their paths. At high detail, live maps of a disaster area could quickly reveal people in need of rescue as well as the safest routes in or out. Satellites images are already helping the police catch illegal fishing operations. Higher detail may make it possible to catch other criminals in the act. The images could also make it easier for farmers to watch over their crops or for scientists to find minerals. Also, these images play a very important role in monitoring the health of forests and other landscapes.

What do you think? Would you like to see everyone accessing high-detail live maps of the Earth's surface? Please share your idea with us on the website.

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