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题型:阅读理解-阅读单选 难度:0.65 引用次数:120 题号:22093759

The concentric circles (同心圆状斑点), also known as eyespots on butterfly, not only look like real eyes but may also appear to glare directly at predators (捕食者) from many directions, scientists have found. This visual illusion, called the “Mona Lisa effect”, could scare would-be attackers and buy the insects enough time to escape.

Scientists suspect that eyespots, with dark “pupils (瞳孔)” in the center look like real eyes to predators. Hannah Rowland, an ecologist at the Max Planck Institute wanted to see if the direction of this fake gaze contributed to the effect.

First, Rowland and her co-author trained chicks to attack a worm hidden behind a paper printout of two eyespots at the end of a path. When the eyespots’ pupils were specifically pointed in the chicks’ direction, the birds repeatedly ran toward the paper and then backed away, and they waited a few minutes before attacking. But when the pupils instead appeared to look away from the direction of the chicks’ approach, the birds attacked in seconds. Centrally located pupils, though not as effective as ones that stared directly at the chicks, resulted in longer delays than pupils that looked the other way.

“This suggests that they really are paying attention to the direction of the pupils in the eyespots and are perceiving them as eyelike stimulation. The concentric eyespots found most often in the insect world may seem to the chicks like a pair of eyes that follow them regardless of approach angle,” says Rowland.

National University of Singapore evolutionary biologist Antonia Monteiro, who was not involved in the research, says the study is a “cool” demonstration of an evolutionary theory for eyespots. “These butterflies can be encountered from all angles, so having the pupil centrally located ends up being pretty good,” Monteiro says. Still, she says, the eyespots used in the study were several millimeters larger than even the largest commonly found in nature, raising the possibility that the chicks may have been extra frightened by the size of the paper eyes.

1. What is the function of eyespots on the butterfly?
A.Making them look more beautiful.B.Spotting potential dangers.
C.Helping them identify the direction.D.Protecting them from being attacked.
2. How did the chicks react when shown the specifically-pointed eyespots?
A.They attacked immediately.B.They turned away in seconds.
C.They reacted cautiously.D.They became very excited.
3. What does Monteiro mean in the last paragraph?
A.The eyespot is a butterfly’s powerful weapon.
B.The experiment needs further proof.
C.The study first proposes an evolutionary theory of eyespots.
D.Butterflies in nature have small eyespots.
4. What’s the purpose of the text?
A.To appeal to readers to preserve butterflies.
B.To uncover the hidden biological secret of butterflies.
C.To analyze the social behaviour of butterflies.
D.To demonstrate the evolutionary theory for eyespots.
2024·四川·模拟预测 查看更多[2]
【知识点】 动物 科普知识 说明文

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【推荐1】When I was a baby, I entertained you and made you laugh. Whenever I was “bad”, you'd shake your finger at me and ask, “How could you?”--but then you'd give up, and roll me over for a belly scratch and I believed that life could not be any more perfect.

My housetraining was a long process, because you were terribly busy, but we worked on that together. We went for long walks, runs in the park and car rides. We stopped for ice cream. I took long naps in the sun waiting for you to come home at the end of the day.

Gradually, you began spending more time at work and on your career, and more time searching for a human mate. Eventually, you fell in love. She, now your wife, is not a dog person, but I still welcomed her into our home. I was happy because you were happy. Then the human babies came along and I shared your excitement, I was fascinated by their pinkness, how they smelled, and I wanted to mother them too. Your wife was afraid I would bite them. But nevertheless, as they began to grow, I became their friend.

Now, you have a new job in another city and you and they will be moving to an apartment that does not allow pets. You've made the right decision for your “family”, but there was a time when I was your only family.

I was excited about the car ride until we arrived at the dog pound. It smelled of dogs and cats, of fear, of hopelessness. You filled out the paperwork and said, “I know you will find a good home for her.” They shrugged and gave you a pained look. The children were in tears as they waved me goodbye. And “How could you?” were the only three words that swept over my mind.

Is it better to live with hope or without hope? At first, whenever anyone passed my pen , I rushed to the front, hoping it was you, that you had changed your mind and that this was all a bad dream.

My beloved master, I will think of you and wait for you forever. I hope you receive more faithfulness from your family than you showed to me.

1. Why was the dog excited about the car ride?
A.It thought of moving with its master.
B.It hoped to be adopted(收养)by another family.
C.It was longing for the life at the pound
D.It was happy about its master's decision.
2. The underlined sentence in Paragraph 5 shows that ________.
A.the dog had done many bad thingsB.the dog would be given less care
C.the master's decision upset the dogD.the master left the dog with regret
3. Which is true about the dog when it lived at the pound?
A.It felt disappointed with its master.B.It continued to love its former owner.
C.It did not trust humans any more.D.It was excited about the pound.
4. What is the theme of the story?
A.Be ready for changes.B.Never expect too much.
C.Never complain about your life.D.Be faithful to those who love you.
2019-06-27更新 | 116次组卷
阅读理解-阅读单选(约340词) | 适中 (0.65)
文章大意:本文是说明文。研究人员发现,与其他许多课堂放松的活动相比,每周两次与狗在一起度过一段时间能更好地减轻学生的压力。

【推荐2】Dogs in the classroom lower stress of primary school students, new research has found. The study by UK researchers found spending some time with a dog twice a week was better for reducing stress on students than many other classroom relaxation activities. And the benefits of these “dog dates" were similar for children in both normal and special schools.

Stress is known to negatively affect a child’s learning, behaviour, health and mood. This has led schools to try a number of ways to reduce stress, including yoga, mindfulness, physical activities and even having animals in classrooms.

The researchers from the University of Lincoln measured students' stress levels by tracking the level of the stress in their saliva (唾液). They studied 105 students aged 8 to 9 in four normal schools as well as 44 children of a similar age in seven special schools in the UK. The children were randomly (任意) divided into three groups: a group that spent time with a dog; a group that spent time doing relaxation activities; and a “control” group that did neither of these things. Students in the dog group spent 20 minutes with a trained dog twice a week for four weeks. The relaxation group spent the same amount of time doing exercises.

The researchers found that the children in the dog group had “significantly lower” stress levels, while those in the relaxation and control groups recorded an increase over the school term. The study, which was published in the journal PLOS ONE, also found stress was lowest in the children in the dog group immediately after their contact with the puppies. “Dog-assisted activities can lead to lower stress levels in schoolchildren with and without special educational needs,” University of Lincoln researcher Kerstin Meints said, “but more research is needed to discover what was the ideal amount of time and contact with dogs for the best effect.”

1. What is the benefit of having dogs in the classroom according to the research?
A.Relieving stress for students.B.Making students feel less lonely.
C.Strengthening students' health.D.Improving students’ learning ability.
2. How did the researchers get the findings?
A.By analyzing causes.B.By providing examples.
C.By listing facts.D.By making comparison.
3. What does the research show according to the last paragraph?
A.The proper contact time with dogs still needs further study.
B.Dogs have more effects on the children in special schools.
C.The children doing more exercises have the lowest stress level.
D.The children spending most time with dogs are lowest in stress.
4. What can be the best title for the text?
A.Students need the company of dogs
B.Classroom dog dates reduce kids’ stress
C.A new research about dogs is carried out
D.Dog-assisted activities become popular in UK
2022-09-03更新 | 79次组卷
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文章大意:这是一篇记叙文,文章主要讲述作者在桑布鲁国家保护区给大象Rommel戴上跟踪仪的经历。

【推荐3】I was mostly based in Samburu National Reserve, recording details of the population and leading collar (颈圈) operations. We put trackers (跟踪仪) around wild elephants’necks, so we can learn about their activities.

In May 2009, in the middle of the wet season, Rommel appeared again. And it was histurn to be placed a collar. We sent three cars out to search for him. There’s a river running through the park where many elephants gather in the mornings. At 10:30 am, one of my partners clocked Rommel.

A tranquillizer (镇静剂) was carefully shot into his body so we could safely place a collaron him, but for a bull of Rommel’s size it could take longer. After that, he turned away, heading in an unexpected direction and seemed to be near danger by killing himself in thewater. It would be a bad accident. Only by pulling his trunk (象鼻) from the river, could weensure his survival. The problem was that the river was a little bit changeable. Immediately, I decided to act. I jumped in and lifted his heavy, twitching trunk from the water with the help of lifeguards. The team tried to fit him with a collar, but we discovered that we didn’t have one big enough.

We couldn’t risk keeping him there while we created a bigger collar. So I struggled on, holding his trunk high with all my strength. And medicine that took away the efforts of the tranquillizer was delivered.

As soon as his ears started to move, a sign of coming to life, I dropped his trunk and moved to safety. Within a couple of minutes, he was back to life. That was one of my proudest moments

1. What is the purpose of putting trackers around wild elephants’necks?
A.To record their sizes.B.To know their activities.
C.To control and train them.D.To save them from danger.
2. Why was it necessary to shoot tranquilizer into Rommel’s body?
A.To sent him to a zoo.B.To treat his wounds.
C.To place a collar on him safely.D.To check his health.
3. What did the author do to ensure Rommel’s survival?
A.He gave him certain medicine.B.He lifted his trunk out of water.
C.He performed an operation on him.D.He called other members for help.
4. What kind of feeling did the author have after Rommel’s coming to life?
A.Pride.B.Surprise.C.Anger.D.Worry.
2024-01-02更新 | 74次组卷
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