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题型:阅读理解-阅读单选 难度:0.65 引用次数:39 题号:11099289

Wildlife tracking is nothing new, but it's certainly not without limitations. When pursuing animals, particularly birds, in some places like rough mountains and vast oceans, the traditional method, VHF tracking which uses GPS tags (跟踪器), often ends up with the signal of animals lost.

A newly developed set of UAVs (无人机) with radio tags aims to solve this problem. ''The swift parrot was the original inspiration for the development of the system. The swift parrots are migratory (季节迁徙的) birds. Before reaching their destination, they'll fly across vast areas of land. Besides, during their flying, they tend to choose a random place for temporary food and rest. And they use different areas as their destinations each year depending on where their food is available. So their destinations each year can also be random. The randomnness can make it hard for us to judge in advance where they'll exactly go and more difficult to track them,"explains Saunders.

"So it's necessary to use tags to track them. But GPS tags are not congruent with swift parrots since these creatures are too small, which makes it hard to attach the large GPS tags to them. Besides, GPS signals can be poor in remote and rough areas. Therefore we had to find a new way to search large pieces of land more effectively. We had an idea to attach smaller radio tags to them and use particular UAVs to track those radio tags to study their movements."

These UAVs only need to fly beside the parrots to track their whereabouts while other systems need to fly directly overhead for a visual sighting. Saunders says, "Our system listens for tag signals, and works most effectively at a distance so it can identify where the animals are and help us observe them without influencing their flying routes."

As for the improvement of UAVs, now the scientists want to develop a version that has stronger lifting ability and flies farther without being charged in the midway. And then it can track animals in more remote and rough surroundings that were previously inaccessible, and shed light on species that have been unable to be tracked until now.

1. What is the major problem of traditional wildlife tracking?
A.Failing to reach rural areas.B.Failing to follow routine methods.
C.Losing track of GPS tags sometimes.D.Losing track of the animals sometimes.
2. What can be learned about swift parrots according to Paragraph 2?
A.UAVs are modeled after their shape.B.UAVs can be attached to their bodies.
C.Their migratory route can be hard to predict.D.Their flying can get interrupted by humans.
3. What may be the strength of UAVs designed by the researchers?
A.They can fly quite high in the sky.B.They help catch and attack their targets.
C.They help track birds without disturbing them.D.They can record the sounds sent by various birds.
4. How will the scientists probably improve their UAVs?
A.By getting rid of radio tags.B.By reducing their production cost.
C.By increasing their weight and size.D.By improving their energy storage and engines.

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阅读理解-阅读单选(约510词) | 适中 (0.65)
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文章大意:这是一篇说明文。文章讨论了Carolyn Gauff及其团队努力了解蚊子,尤其是携带危险疾病的蚊子是如何找到并攻击人类的。

【推荐1】Of the more than 3,000 species of mosquitoes in the world, just a small number specialize in sucking human blood. How mosquitoes track us down so effectively isn’t currently known, but it matters, since they carry dangerous diseases which may cause death.

“In fact, stopping these annoying insects in their tracks could save up to half a million lives lost to those diseases each year,” said Carolyn Gauff, a professor of ecology and evolutionary biology at the Princeton Neuroscience Institute. That’s why Gauff’s team wanted to understand how they find and target humans.

Mosquitoes mostly choose what to bite based on odor (气味). Knowing how a potentially disease-carrying mosquito finds a person, while ignoring other warm-blooded animals, is a key question. But it’s not easy to answer, since any animal smell is made up of hundreds of chemicals mixed together in specific percentage. “The actual chemicals that are found in human odor are basically the same as the chemicals found in animal odor—it’s the percentages and the relative large amount of those substances in human mixtures that’s unique,” said Gauff.

To investigate, researchers decided to record neural activity in the brain of mosquitoes while exposing them to natural human and animal odor samples. They collected odor samples from about 40 different animals. When they compared some of those with the 16 human samples, something jumped out. Decanal is particularly rich in human skin. Common in the natural world, in humans, decanal comes from another, more complex substance. When one component of our skin’s natural oils, sapienic acid, breaks down, decanal is left over. This acid is only found in human beings. It’s what likely leads to the high levels of decanal that help the mosquitoes smell their way to us.

Understanding what the mosquitoes are targeting is only part of the story; knowing how they do it is also important. To see exactly how mosquitoes use this sense, scientists used genetically modified (转基因的) mosquitoes so that they could cut open mosquitoes’ heads and watch neurons firing when they’re exposed to human and animal odors. The research team already knew that mosquitoes have about 60 different types of neurons that sense odors, so when they looked in the insects’ brains, they thought they might see a lot of activities. But it was surprisingly quiet, meaning that the signal was perhaps quite simple, down to just a couple types of neurons. “One type of neuron responded really strongly to both humans and animals. Another type of neuron responded to both—but it responded much more strongly to humans than animals,” Gauff said.

How to keep mosquitoes’ decanal signal from being transmitted will be the research team’s next focus. Gauff hoped their current work could be used to make mosquito killers and attractants to prevent disease.

1. What’s the final purpose of the research conducted by Gauff’s team?
A.To study why only certain mosquitoes suck human blood.
B.To investigate the neural activity in mosquitoes’ brains.
C.To test the effectiveness of mosquito killers.
D.To help prevent deadly diseases caused by mosquitoes.
2. To which substance(s) would mosquitoes mostly be attracted?
A.Remains of decomposed sapienic acid.B.Chemicals in the environment.
C.Decanal generated in human blood.D.Natural oil from human skin.
3. What can we learn from the passage?
A.Chemicals found in human and animal odors are quite different.
B.Genetically modified mosquitoes are not sensitive to human odor.
C.Further research will focus on odor signal and neural connection.
D.Most mosquito neurons are not involved in responding to human odor.
4. From the last paragraph, which option accurately describes the future usage of Gauff and his team’s research?
A.Developing more effective mosquito killers.
B.Studying of mosquito neural connections in response to odor signals.
C.Analyzing the types of neurons in mosquitoes.
D.Discussing the benefits for preventing mosquitoes from transmitting the decanal signal.
2024-03-16更新 | 123次组卷
阅读理解-阅读单选(约350词) | 适中 (0.65)
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【推荐2】Dodder is an unusual and unwanted plant that attacks other plants. Except for its flowers, the plant looks like spaghetti, a kind of noodles in the shape of long thin pieces that look like string when they are cooked. Its almost leafless, thread-like stems(茎)hang down on top of other plants that dodder needs to stay alive. Dodder does not produce its own food. Instead, it steals food from other plants. It feeds by sucking juices from the plant which is wrapped around, often making its host very weak or even killing it.

Dodder can find other plants by their smell. When a young dodder plant starts growing, it follows the smell of plants it prefers, like tomato plants, potato plants, or other farm crops. Unlike most plants that usually grow in the direction of light or warmth, a dodder plant will grow in the direction of, for example, tomato smell-if a tomato happens to be growing nearby.

However, a young dodder plant must find a host plant quickly. It no longer needs its root once it is attached to the host and wrapped around it. If it cannot catch a smell of a potential host within a few days, it will dry up and disappear-even if there is plenty of water around. Once it finds a host, the young dodder plant will attach itself to it and start growing faster. At that point the dodder plant will drop its root.

Dodder is thus a difficult weed to manage and a real headache for farmers. When it does get out of hand, dodder can greatly reduce a farmer’s harvest or even destroy crops completely. Before sowing their produce, especially farmers in warm parts of the world often check to make sure no unwanted dodder seeds have mixed with their crop seeds. This is a good way to stop dodder plants from making their way to a crop field secretly.

1. Why does the author mention spaghetti in the first paragraph?
A.To analyze the content of some food.
B.To describe the shape of dodder plants.
C.To explain where the dodder plants come from.
D.To argue that dodder plants can be used.
2. What will happen if a dodder plant starts growing where there are no other plants around?
A.It will die sooner or later.
B.It will grow deep roots.
C.It will attract other plants.
D.It will cover the entire area of soil.
3. What can be inferred from the passage?
A.Dodder does not produce its own food.
B.Dodder can affect farmers’ income.
C.Dodder can only survive in the shade.
D.Dodder only grows in the warm areas.
4. What is the main topic of the passage?
A.A new variety of farm crops.
B.Plants that are harmful to humans.
C.The special abilities of a dangerous plant.
D.Recent improvements in farming methods.
2018-04-09更新 | 320次组卷
阅读理解-阅读单选(约300词) | 适中 (0.65)
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【推荐3】Some 128 baby squids from Hawaii are in space for a study. The baby Hawaiian squids come from the University of Hawaii's Kewalo Marine Laboratory. They are about 7.6 centimeters long. There are plenty of these tiny animals in Hawaiian waters. The squids will come back to Earth in July. They rode on a SpaceX spacecraft along with thousands of kilos of supplies for the International Space Station on June 3.

Jamie Foster is conducting the study as a researcher at the University of Hawaii with the help of Dr. Margaret McFall-Ngai, a member of the National Academy of Sciences. The Honolulu Star-Advertiser newspapers reported that she studies how spaceflight affects the squids. The research, started in 1989, can help scientists learn about human health during long trips in space.

Squids have a relationship with natural bacteria that help them control their giving off light. Margaret said, “When astronauts are in low gravity, their bodies' relationship with bacteria changes. Bacteria are very important to the human body and health. The relationship of humans with bacteria is disturbed in low gravity, and Jamie has shown that it is true in squids," said Margaret. "And, because it's a simple system, she can get to the bottom of what happens."

“As astronauts spend more and more time in space, their immune systems don't function well,” Jamie said. "Their immune systems don't recognize bacteria easily. They sometimes get sick. Understanding what happens to the squids in space could help solve health problems that astronauts face."

She said, "The immune system does not work properly on long spaceflights. If humans want to spend time on the moon or Mars, we have to solve health problems to get them there safely.”

1. What's the purpose of the research?
A.To know the situation in space.B.To study squids' living conditions.
C.To check astronauts' immune systems.D.To help solve astronauts' health problems.
2. Why do the squids become the object of the research?
A.They have a relationship with space.
B.T hey can control their giving off light.
C.They have something in common with people.
D.They can solve the problems of natural bacteria.
3. What is Margaret's attitude to the research?
A.Uncaring.B.Positive.C.Uncertain.D.Curious.
4. Where can the text be found?
A.In a novel.B.In a history book.C.In a travel brochure.D.In a science magazine.
2021-12-23更新 | 191次组卷
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