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题型:阅读理解-阅读单选 难度:0.65 引用次数:67 题号:17651038

Hawks(鹰) and other raptors(猛禽) are impressive predators, and many of these species are adapted for fast, quiet flight to help them attack their prey(猎物). After all, raptors make their living by flying down to take small animals off the ground. While a hawk clearly couldn’t lift a full-grown dog, it might seem reasonable that raptors could lift a small dog, cat or possibly even a human child. Is that a reasonable concern, or just a flight of fancy?

There are urban legends about hawks stealing 12-pound pets, and some taking away kids, but these are based on wrong descriptions of how much weight these raptors can lift. Hawks and owls, for instance, can’t fly away with prey that outweighs them. And given the light weight of even big raptors like red-tailed hawks and great-horned owls —which average about 2 pounds and 3 pounds separately, — they’re unable to take away most adult dogs and cats, not to mention human children.

Some larger red-tailed hawks may be able to carry prey weighing 5 pounds,which could include not just puppies and kittens but also some adult cats and dogs from small kinds. Great-horned owls also focus on small mammals and birds, but they have the most diverse diet of any North American raptor, including larger animals like skunks, ducks and even other raptors. They don’t create a serious threat to pets overall, although they have been known to attack house cats and chickens left outside overnight.

While most pets and kids are probably safe from raptors, it still might be wise to take a few precautions, depending on the situation.

One of the most effective precautions is to watch over your pets when they’re outdoors, which is generally wise anyway, for their safety as well as that of your neighbors and local wildlife. Some pet owners try to drive raptors away, using reflective tape and so on. Some of these might work, at least for a while, but they can’t replace human supervision. If raptors fly down at your pet, an umbrella could help prevent off some species, while a flashlight can reportedly discourage owls after dark.

The presence of wild raptors suggests you live in a healthy ecosystem, and if you can bear to share space with them, there’s a good chance they’ll repay you for your tolerance. Instead of hunting pets, for example, many raptors are far more likely to hunt pests like rats.

1. What does the author think of a hawk taking away a kid?
A.It’s just imagination.
B.It’s a reasonable statement.
C.It remains to be proven.
D.It may happen as to big raptors.
2. What do we learn about raptors, like hawks and owls?
A.Some big hawks can lift up to 12 pounds.
B.Red-tailed hawks can carry cats and dogs, large and small.
C.Great-horned owls prefer to eat small animals rather than large ones.
D.Great-horned owls in general cannot lift more than 3 pounds.
3. Which can best protect your pets from raptors?
A.Use reflective tape.
B.Use a flashlight at night.
C.Keep an eye on your pets as much as possible.
D.Keep your pets under the umbrella all the time.
4. It’s not always a bad thing to have raptors around because________.
A.they can scare away harmful animals
B.they may help you catch rats and other pests
C.it helps to keep the ecosystem in balance
D.it helps you understand the importance of tolerance
5. What is the main idea of the passage?
A.How to protect pets from raptors.
B.How raptors get their food.
C.What prey raptors usually feed on.
D.Whether raptors catch pets or kids.
【知识点】 动物 科普知识 说明文

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【推荐1】Researchers at the DogStudies lab at the Max Planck Institute for the Science of Human History have shown that dogs may possess some metacognitive (元认知) abilities. Specifically, when they do not have enough information to solve a problem, they will actively look for more information, similarly to primates (灵长类).

In a recent study, project leader Julia Belger explored whether dogs have metacognitive abilities. To test this, the researchers designed a device involving two V-shaped fences. A reward, either food or a toy, would be placed by one researcher behind one of the two fences while another researcher held the dogs. In some cases, the dogs could see where the reward was placed, while in others, the dogs could not. The researchers then analyzed how frequently the dogs looked through the gap in the fence before choosing an option.

The researchers found that the dogs did check significantly more often for the reward when they had not seen where it was placed. These results show that dogs do tend to actively seek extra information when they have not seen where the reward is concealed.

The results did not allow the researchers to say definitively whether dogs possess meta-cognition, though they displayed some evidence for it. Julia said, “For humans, vision is an important information gathering sense. In this case, our experiment was based on a checking action relying on sight, but the dogs probably also used their sense of smell when checking through the gap. We know that smell is very important to dogs and we could see that they were using it.”

Julia added, “In future, we would like to develop an experiment to investigate under what circumstances dogs decide to use their sense of smell versus sight. This may give us additional insights into their information seeking abilities.”

1. What ability may dogs have according to the study?
A.To offer information like primates.B.To use their skills to find more food.
C.To seek information to solve a problem.D.To ask for help before choosing an option.
2. What does the underlined word “concealed” in paragraph 3 mean?
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4. In which section of a newspaper can you probably read the text?
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【推荐2】Wind power is one of the most powerful tools for reducing carbon emissions(排放) that cause climate change. Turbines(涡轮机), however, can be a threat to birds, which is why experts are looking for ways to prevent the danger.

A Boulder, Colorado company has produced a camera- and AI-based technology that can recognize eagles as they approach in enough time to shut off turbines in their flight path. Their tool, called IdentiFlight, can detect 5.62 times more bird flights than human observers alone with an accuracy rate of 94 percent. Using high-precision sensors, the system calculates a bird’s speed and flight path, and if it is on a crash path with a turbine, a signal is sent to shut that turbine down.

Winning an award for its performance in Australia, the tracking system was set up in 2018 at a Tasmanian facility and was found to cut eagle deaths at the Cattle Hill Wind Farm by more than four fifths. Each day, signals have shut down their movement an average of 400 times—across the field of 48 turbines—for 2 to 3 minutes each time.

Across the globe, Duke Energy in Wyoming is employing the same technology with impressive results at its Top of the World Windpower Project. Top of the World was the first wind site to use the technology. In 2014, IdentiFlight’s maker, Boulder Imaging, used Top of the World for testing after eagles were killed by the turbine, which left Duke Energy in violation(违反) of the Migratory Bird Treaty Act. 47 units made of eight wide-angle cameras now constantly scan(扫掠) the sky to monitor all 110 turbines. The camera unit is mounted to the top of a 30-foot pole and powered by software that learns and improves with each photo taken.

Bird lover Garry George admits, “IdentiFlight makes it possible to protect the birds we love in the process of reducing the worst effects of climate change.”

1. What can IdentiFlight do?
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【推荐3】It might seem that a fish needs a car because fishes actually make pretty good drivers, according to a new experiment.

Researchers at Ben-Gurion University of the Negev in Beer Sheva, Israel taught six goldfish to drive a motorized water tank. Whenever the fish swam near one of the tank’s walls, facing outward, the vehicle moved in that direction. That these fish could move on land gave the researchers the conclusion that fishes’ understanding of space and direction is not limited to their natural environment.

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In the experiment, during their first lessons, the fish averaged about 2.5 successful trips to the target. During their final lessons, they averaged about 17.5 successful trips. Finally, the animals also took faster, more direct routes to their goal.

In further experiments, the goldfish were still able to reach the pink board when starting from random positions around the room, rather than the center. This finding confirmed that the fish had not merely memorized a set of movements to reach their reward, but were planning routes toward their prize each time. When the researchers tried to hoax the goldfish by placing boards of different colors on the other walls or moving the pink board to the other side of the room, the fish were not fooled, and navigated to the pink board.

Behavioral neuroscientist Kelly Lambert was “not completely surprised” by the driving abilities of the fish. In her research at the University of Richmond in Virginia, Lambert has taught rats to drive toy cars. “But teaching goldfish to navigate such unfamiliar land takes animal driving experiments to the next level,” Lambert said. “I love the fish out-of-water idea. When it comes to testing the limits of animal navigation, it’s important to diversify and expand our tasks and our species.”

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