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题型:阅读理解-阅读单选 难度:0.65 引用次数:145 题号:21585603

Birds rely on their keen sense of hearing to detect prey(猎物) and identify other birds on the basis of their songs. In fact, birds have better hearing than humans, so they hear with much more detail. So how do birds hear?

Birds and humans both have an inner ear and a middle ear. However, birds differ from humans in that they lack an external ear structure. Where humans have an outer ear organ, birds have a funnel-shaped(漏斗状的) opening that functions as their outer ear, located on each side of their head. These openings are usually positioned behind and slightly below a bird’s eyes and are protected by soft feathers.

The position of a bird’s head also plays a role in its hearing abilities. Scientists have determined that noises register(显示) at different frequencies on each side of the bird’s head. Depending on the angle from which the noise originates, it registers with a certain frequency in the left eardrum(耳膜) but with a different frequency in the right eardrum. This allows the bird to locate a sound’s origin.

Let’s take a look at owls. They are known for their extremely accurate hearing, which helps them locate prey at night. This hearing ability is partly due to the unbalanced arrangement of the ear openings, with one opening being lower than the other. Sounds register in these openings at slightly different times. Owls can use this time difference, which is only 30 millionths of a second, to determine whether the sounds are coming from their left or their right. Other birds of prey have small covers in front of their ears that help them determine whether sounds are coming from above them or below them. Some owls do appear to have ears on the top of their head, but those are actually feathers controlled by small muscles under the skin that do not affect their hearing at all.

1. According to paragraph 2, what is the major difference between birds’ ears and humans’ cars?
A.SizeB.Position.C.Structure.D.Function.
2. What does the underlined word “This” in paragraph 3 probably refer to?
A.Each side of the bird’s head.
B.Sound quality around the bird.
C.The angle from which the noise comes.
D.The difference in frequencies between the eardrums.
3. What is the purpose of the last paragraph?
A.To give examples.B.To present the main idea.
C.To draw a conclusion.D.To compare different opinions.
4. Which of the following can be the best title for the text?
A.Different Senses of BirdsB.Amazing Abilities of Birds
C.The Secret of Birds’ HearingD.The Origin of Birds’ Hearing
【知识点】 动物 说明文

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【推荐1】Turtles have a problem. They are delicious. And so are their eggs. That has led to the eggs of marine turtles being poached (偷猎).

To deal with the problem Kim Williams-Guillen and Helen Pheasey of the University of Kent, have come up with a handy gadget (小装置). It is a global-positioning-system (GPS) transmitter (发射机) enclosed in a plastic shell made by 3D printing. The result looks like a turtle's egg and weighs about the same. Dug up and carried away by poachers, it can lead the police to those poachers' bases of operation.

As they report this week in Current Biology, Dr Williams-Guillén and Dr Pheasey have now tested their invention in Costa Rica. They placed a decoy egg into each of 101 turtle nests on four beaches where poaching is a problem. The decoys remained inactive until their shells were exposed to the air. At that moment—presumed to signal the arrival of poachers—the “egg” in question starts broadcasting its location once an hour.

In all, 25 of the decoys were poached. They told different stories. Some travelled just a few kilometres, with one ending up at a bar 2km away from the nest it was taken from, where its signal abruptly ended. Others went quite a distance. One, for example, was carried 137km inland, to a supermarket.

To make sure that they, themselves, were not harming what they were intending to protect, the researchers monitored all of the decoy-laden nests which had survived the attentions of poachers and compared these nests' outputs of hatchlings with those of 44 other surviving nests that had no decoy in them. Both sorts of nest had the same hatching rates, suggesting that adding a decoy did not affect the development of the eggs it was hidden among.

Given the success of their project, Dr Williams-Guillen and Dr Pheasey propose that the idea should be used more widely for turtles. They also suggest that similar decoys might help protect the eggs of other endangered reptiles—and birds—that are collected and traded illegally.

1. What is the purpose of the new invention?
A.To make man-made turtle eggs.
B.To track the poachers of turtle eggs.
C.To protect turtle eggs from poachers.
D.To locate turtle eggs and send signals.
2. What do we know about the decoy eggs that researchers have tested?
A.About a quarter of them were poached.
B.They appeared different from real turtle eggs.
C.Their shells would break if exposed to the air.
D.They gave warnings about approaching poachers.
3. What do Dr Williams-Guilén and Dr Pheasey think of their invention?
A.It may cause widespread damage to turtle eggs.
B.It will help raise people's environmental awareness.
C.It can be applied to more wildlife conservation fields.
D.It needs further improvement before being put into practice.
4. What is the best title for the text?
A.A New Device May Help Stop the Robbery of Turtle Eggs
B.Researchers Propose a New Idea to Save Poached Turtle Eggs
C.GPS Will Update Researchers on the Developments of Turtle Eggs
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2020-12-15更新 | 167次组卷
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1. What does the underlined word “bopping” in the first paragraph mean?
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2. How do rats differ from humans in response to music?
A.They seem more interested in pop music.B.They make similar movements to different rhythms.
C.They prefer moving their heads with the beat.D.They are unable to predict the beat of music.
3. What is Patel’s attitude towards the study?
A.Uncaring.B.Doubtful.C.Positive.D.Disapproving.
4. What is the text mainly about?
A.Music affects rats’ brains.B.Humans are the only animals that move to music.
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Part of the inspiration for the idea came when Gavin was a young boy. He found an overgrown bonsai tree (盆景树) which looked like a chair.

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