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For more than twenty years scientists have been seeking to understand the mystery of the “sixth sense” of direction. By trying out ideas and solving problems one by one, they are now getting closer to one answer.
One funny idea is that animals might have a built-in compass(指南针).
Our earth itself is a big magnet(磁体). So a little magnetic needle that swings freely lines itself with the big earth magnet to point north and south. When people discovered that idea about a thousand years ago and invented the compass, it allowed sailors to navigate (航海)on ocean voyages, even under cloudy skies.
Actually the idea of the living compass came just from observing animals in nature.
Many birds migrate twice a year between their summer homes and winter homes. Some of them fly for thousands of kilometers and mostly at night. Experiments have shown that some birds can recognize star patterns. But they can keep on course even under cloudy skies. How can they do that?
A common bird that does not migrate but is great at finding its way home is the homing pigeon. Not all pigeons can find their way home. Those that can are very good at it, and they have been widely studied.
One interesting experiment was to attach little magnets to the birds’ heads to block their magnetic sense—just as a loud radio can keep you from hearing a call to dinner. On sunny days, that did not fool the pigeons. Evidently they can use the sun to tell which way they are going. But on cloudy days, the pigeons with magnets could not find their way. It was as if the magnets had blocked their magnetic sense.
Similar experiments with the same kind of results were done with honeybees. These insects also seem to have a special sense of direction.
In spite of the experiments, the idea of an animal compass seemed pretty extraordinary. How would an animal get the magnetic stuff for a compass.
An answer came from an unexpected source. A scientist was studying bacteria that live in the mud of ponds and marshes. He found accidentally little rod-like bacteria that all swam together in one direction—north.
Further study showed that each little bacterium had a chain of dense particles inside, which proved magnetic. The bacteria had made themselves into little magnets that could line up with the earth’s magnet.
The big news was that a living thing, even a simple bacterium, can make magnetite. That led to a search to see whether animals might have it. By using a special instrument called magnetometer, scientists were able to find magnetite in bees and birds, and even in fish. In each animal, except for the bee, the magnetic stuff was always in or closer to the brain.
Thus, the idea of a built—in animal compass began to seem reasonable.
The Magnetic Sense — The Living Compass | |
Passage outline | Supporting details |
The existence of the earth magnet and the invention of the navigating compass | ◇Our earth is a big magnet and a little freely ◇ |
The possibility of birds’ built-in compasses | ◇ One piece of evidence is the ◇ Birds can recognize star patterns on clear nights and keep on course |
The | ◇Little magnets were tied to the pigeons’ heads to ◇The pigeons’ magnetic sense seemed to be affected on ◇Similar things with the same results were done with bees. |
The | ◇Little rod-like bacteria were found by chance to swim together in the direction of ◇Some animals had a chain of dense magnetic particles in or close to the |
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【推荐1】Home sweet home
No matter how far you've travelled, there's always something special about coming home. It might be your comfortable bed or your mum' s special dish or walking round your local park that makes you feel so happy and comfortable there.
There's a new generation of " children of the world". With more people moving abroad, it's easy to feel like you have many different homes. However, I think this is positive-you lead an enriched life and you learn to value what, where and who really matters to you.
A.And when the world is your shelter |
B.Your new town may not be familiar |
C.Some tips to help with homesickness |
D.A great wave of homesickness swept over me |
E.Homesickness is something almost everyone suffers from |
F.As these are the things that made you cry with homesickness |
G.Although I'm used to travelling around and living away from home |
【推荐2】If you want to keep fit, please refer to the following:
Move more
Make it a daily habit to find ways to move your body. Some techniques given by experts are to think positive thoughts. Walk your dog; play with your kids.
Give up Smoking
Ever since 1960 when it was announced that smoking was harmful to health, Americans have been reducing their use of tobacco products. Just recently, we’ve seen more and more teens smoking. Could it be the Hollywood influence? It seems that the stars in every movie smoke cigarettes. Take care!
While recent studies show a glass of wine or one drink a day can help protect against heart disease, more than that can cause other health problems such as liver and kidney (肝和肾) disease and cancer.
Reduce Stress
It is easier said than done.
Protect Yourself From Pollution
A.Stress comes in many ways. |
B.Avoid Excessive (过量) Drinking. |
C.Warn your children against smoking. |
D.Think carefully about what you will do. |
E.Climb stairs instead of taking the elevator (电梯). |
F.There are many things you can do to move your arms and legs. |
G.If you can’t line in a smog-free environment, at least avoid smoke-filled rooms. |
【推荐3】Entering competitions can be fun, and it’s a good way to hone(磨炼)your skills. While you can’t expect to win every time, you can increase your chances of winning with the right strategy and preparation. These are general tips that can be applied to your competition of choice.
Research and choose the right competition.
Don’t psych yourself out. Plenty of people get scared off by a competition’s requirements and don’t enter in the first place.
Learn your competition. Remember that you’re not competing with everyone in the competition. There may be many applicants and candidates, but there will only be a few contenders(竞争者)and finalists.
Make a checklist. Everyone has different productivity styles. If it helps, consider making a training checklist.
A.Stick to your training. |
B.Others drop out along the way. |
C.Give yourself encouraging reminders. |
D.Focus on understanding and beating them. |
E.This is the time to set reasonable and achievable goals. |
F.It provides you a sense of accomplishment along the way. |
G.It might be important if you don’t have a coach to guide you. |
【推荐1】Researchers recently discovered that mosquitoes who have their sleep interrupted would rather get rest than go looking for their next meal. “It was a bit surprising. Sleep deprived (睡眠不足) or not, a blood meal should appeal to them,” said Oluwaseun Ajayi, the leader of the study.
To study mosquitoes, researchers spent more than a year developing ways to analyze how they sleep, and to show the posture of mosquitoes accurately and count their amount of sleep. It was particularly challenging because of something researchers call the “observer effect”. This is when the act of just observing something can change its outcome. In the case of mosquitoes, they’re able to sense that people are nearby due to their body heat, movement, smells and breath. To deal with those circumstances, researchers set up the experiment in a quiet lab where the mosquitoes were several rooms away from anybody who might pass by. They placed cameras and infrared sensors (红外传感器) in the room so they could record whenever the mosquitoes moved without any risk of disturbing them.
Researchers found that the mosquitoes in the lab slept between 16 and 19 hours each day. When mosquitoes were actually in a sleep-like state, their hind legs are lowered, and they bring in their bodies closer to the surface where they are resting. Then, researchers moved their sound equipment regularly at night or during the day to subject them to sleep deprivation. More than three-quarters of the mosquitoes that got to sleep normally went hunting for a blood meal when they were awake. But less than one-quarter wanted to eat after a sleepless night.
Mosquitoes can spread serious diseases to humans. By understanding the sleep rhythms of insects, researchers hope to find new methods to prevent the spread of infections. “In fruit flies, a link between sleep and immunity (免疫力) has been established. And immunity is an important factor for disease transmission in mosquitoes,” Ajayi says. “Based on this, this research would provide us with an understanding of the role of sleep on the disease transmission in mosquitoes.”
1. What did the researchers recently find?A.The regular sleep patterns of mosquitoes. |
B.An effective way to prevent mosquito bites. |
C.The lack of sleep increases the death of mosquitoes. |
D.Sleep deprivation influences mosquitoes’ eating behaviors. |
A.Interrupting the sleep of mosquitoes. | B.Avoiding the impacts of observers’ act. |
C.Figuring out the number of mosquitoes. | D.Placing suitable equipment in the laboratory. |
A.The results of the experiment. | B.The process of the experiment. |
C.The purpose of the experiment. | D.The significance of the experiment. |
A.Conduct research on sleep rhythms of humans. | B.Explore new means of improving human sleep. |
C.Help reduce the diseases spread by mosquitoes. | D.Present the relationship between sleep and immunity. |
【推荐2】Widespread descriptions of animals in pop culture could actually be hurting the animals’ survival chances in the wild, a new research suggests.
Franck Courchamp of the University of Paris-Sud was interested in the idea of “appeal” (吸引力) in animals. He wanted to know: What species do people consider appealing? And what are the influences of being appealing on populations of animals in the wild?
In a research published this month, Courchamp and other researchers list the top 20 appealing species. Most of the animals identified as appealing are large mammals living on land. Coming in first place are tigers, followed by lions, elephants, giraffes, panthers, pandas, cheetahs, polar bears, wolves, and gorillas. However, at least half of the interviewees didn’t realize that five of the top ten most appealing species are threatened. It is strange that we do not protect the species we care about the most.
The study also finds that we are flooded with images of these creatures, even as they are becoming fewer in the wild. The study suggests that too much imagination might be creating a “virtual population” of the animals in peoples’ minds, making them believe there are far more individuals in the wild than is exact.
The study authors suggest that companies who benefit from the use of these images should set aside a small percentage of their profits for protection efforts and informational campaigns. “That would be not only something fair, but something that could bring a win-win situation for them,” Courchamp says. It could bring them positive public relation, for example. Besides, if a company’s mascot (吉祥物) goes extinct, that could hurt them from a marketing point, Courchamp says. But not enough companies are “truly concerned about the protection of the species that they work on,” he adds.
1. It can be inferred that the widespread images of animals in pop culture ________.A.lead people to forget the less appealing animals |
B.make a false impression of the animals’ real situation |
C.raise people’s wildlife protection attention and efforts |
D.bring a win-win situation for both animals and companies |
A.are going extinct |
B.are well protected |
C.are among the best liked |
D.have a large population in the wild |
A.giving examples | B.making definition |
C.making comparisons | D.using numbers |
A.Neutral. | B.Supportive. | C.Positive. | D.Dissatisfied. |
【推荐3】Everyone who knew anything about animals warned me against getting a rabbit in my early 20s, but I ignored them, and ended up with three. It turns out that all the people who are against rabbits have a point: Rabbits get sick all the time, and there are very few vets who specialize in their care. My years with rabbits have been full of feeding, hurried trips to the vet, sleepless nights and begging for advice on the Internet.
Now that my animals are old and weak now, I clear their waste and clean their legs with a rabbit-friendly shampoo. I spend a lot of time on the floor, because although my rabbits are hard to satisfy socially, they also hate to be picked up.
I am often asked the question: Why rabbits? Why not a dog, or a cat? I try to describe what it’s like to be with them. I had never felt a real duty towards anything until I had my rabbits.
My answers never satisfy anyone. I’m not sure about the question, either it so often implies instrumental value, as if the correct reply might be “They make good companions” or “They’re nice to look at”. I don’t have the right kind of reason. I don’t believe in the use value of any living thing. Like humans, animals just are — that’s it. Usually we do not look at other people and think about how to make them work for us. Yet so much of our way of seeing the world is founded on the assumption that animals are meant to serve a purpose. This seems wrong.
After all these years with my rabbits, the only thing I know is that there is no lesson to be learned or value to be acquired. There’s just an effort to be made, and as far as I’m concerned, that’s what life is.
1. Why do people oppose keeping rabbits?A.It’s very boring. | B.It costs a fortune. |
C.It’s rather demanding. | D.It makes the house messy. |
A.Considerate. | B.Knowledgeable. | C.Sociable. | D.Energetic. |
A.Animals should be treated differently. |
B.Animals shouldn’t be judged on some purpose. |
C.The value of animals shouldn’t be ignored. |
D.Humans should live in harmony with animals. |
A.He keeps being true to himself. | B.He reflects on his life more deeply. |
C.He learns to value others’ opinions. | D.He realizes the meaning of life. |
【推荐1】Flow is a cognitive (认知的) state where one is completely immersed (沉浸) in an activity — from painting and writing to yoga and surfboarding.
The process of flow was discovered and coined by the Hungarian-American psychologist Mihaly Csikszentmihalyi. In the 1960s, Csikszentmihalyi studied the creative process and found that, when an artist was in the course of flow, they would insist on their task strictly, regardless of hunger or exhaustion.
One of Csikszentmihalyi’s key points about flow is that a person needs to push oneself out of their comfort zone to stimulate it. Because it’s a dynamic state, one has to constantly adjust the skill level, challenge, and complexity required for the activity.
Flow can also be a tool for better emotion regulation (调节). When a person is in a state of flow, there is little need for doubts or anxieties about oneself or the world in general.
However, pushing yourself to find the flow state can backfire. In fact, trying too hard or wondering whether you are in this state in itself goes against flow. We lose the balance between tension and skill level if we concentrate too much on the task.
A.Even the uncertainties of life fall away. |
B.People may not realize it but anyone can find flow. |
C.Ask yourself if a certain task will fulfill a goal of yours. |
D.Flow can sometimes be viewed as a forerunner for peak performance. |
E.He also found that the artist would highlight the process and not the end result. |
F.As you practice a skill, your level of mastery will change as will the feeling of flow. |
G.It involves intense focus, creative engagement and the loss of awareness of time and self. |
【推荐2】Sleeping with a dim light like a television or nightlight is enough to the raise blood sugar and heart rates of healthy people, according to a new study. Light helps our body maintain an internal clock, but artificial light at night can interrupt the rest and repair that should happen during the sleep. New research suggests that even when our eyes are closed, a small amount of light can disrupt the way our bodies normally keep our blood sugar within a healthy range.
In the study published in Sciences on Monday, scientists asked 20 participants ages 19 to 36 to spend two nights in their lab. On the first night of sleep, the volunteers slept in a very dark room. For their second night of sleep, half of the group snoozed with a small light like the glow of television at night, or streetlights through a window—and half spent their second night in a dark room.
During the trial, all participants were connected to devices that measured different markers of their sleep quality. They were each connected via a special tube, allowing researchers to collect samples without waking the individual. Researchers also recorded participants’ heart rates and brain waves.
When the volunteers awoke in the morning, the team tested their blood sugar and found that participants that slept in rooms with a dim light spent less time in deep sleep. In addition to having slightly worse blood sugar control, the group exposed to dim light had a higher heart rate on average. “By comparison, those that spend two nights in the dark room had little difference in their blood sugar control. They thought they slept well, but your brain knows that the lights are on,” says Zee, “you should clearly pay attention to the light in your bedroom. If you can’t give up your night light, keep it dim and at floor level.”
Earlier work has linked exposure to light during sleep to an increased risk of obesity in women. Zee recommends, “make sure that you start dimming your lights at least an hour or two before you go to bed to prepare your environment for sleep.”
1. What did the underlined word “disrupt” in paragraph 1 mean?A.bother | B.keep | C.disagree | D.follow |
A.By analyzing the data from scientific texts. | B.By conducting the experiments. |
C.Using questionnaires. | D.By comparing earlier work. |
A.The participants would have a higher heart rate. |
B.The participants would have higher blood sugar. |
C.The participants’ blood sugar control would not change. |
D.The participants actually sleep more than average. |
A.Sleeping With a Dim Light Can Raise Health Problems |
B.How to Sleep Well With a Dim Light |
C.Sleep Well, Eat Well, Good Health |
D.The Darker, the Lower Blood Sugar |
【推荐3】A discovery of mummies in the Tarim Basin in China from the 1990s has finally been uncovered. The remains showed evidence of western origin, but after a DNA test, it turns out that these mummies are a bit more local than once thought.
The Tarim Basin is mostly covered by the Taklamakan Desert, which is dry and unlivable for human settlement. Located in central Asia, this was the location of an incredible anthropological (人类学的) find. The remains of thousands of people were discovered alongside clothes, tools, food, and other artifacts. The dry climate created a perfect setting for preservation for what is now known as a 4,000-year-old civilization.
This discovery was noted as even more of a mystery because of the western look of the clothing on the mummies and the burial practices that had never been known before-all of the remains were found laid to rest in wooden boats. This is odd due to the location of the find-the middle of the desert. Many believed that these peoples were wanderers or nomads, but genome sequencing (基因组测序) done on 13 of the mummies by Chinese, European, and American researchers showed that these remains are actually native children of an ancient ice-age civilization.
This genetic (基因的) research is only the beginning. There are still mysteries surrounding this find. “The mummies have long fascinated scientists and the public since their original discovery. Beyond being extraordinarily preserved, they were found in a highly unusual context, and they exhibit diverse and far-ranging cultural elements, ” stated Christina Warinner, an associate professor of anthropology at Harvard. The research surrounding this discovery will continue globally and with every bit of information uncovered, the more the anthropological community, as well as the public, will understand about this incredible find.
1. How did the origin of the mummies come to light?A.By identifying their DNA. | B.By observing the local climate. |
C.By analyzing western mummies. | D.By investigating the past remains. |
A.They date back to 4000 years ago. | B.They combine to form a big puzzle. |
C.They have their own characteristics. | D.They appear in the same livable place. |
A.Hold an international exhibition. | B.Move them to a new protection spot. |
C.Work hard on the fascinating discovery. | D.Focus on the global cultural differences. |
A.Another Breakthrough in Genetic Research |
B.An Incredible Anthropological Find in Asia |
C.China Sees Another Ancient Ice-age Civilization |
D.Mummies in China Carry an Ancient Origin Story |