A butterfly's wings can have many jobs besides keeping the insect in the air. They may be called on to attract mates, to warn potential enemies to stay away, to do other animals or even to provide disguise（伪装）.
All of these roles, though, depend on their colouration—which is unchanging. This plays into the idea that butterfly wings are dead tissue, like a bird's feathers or a mammal's hair. In fact, that is not true. For example, in some species males' wings harbour special cells that release chemicals which attract females.
Nanfang Yu, a physicist at Columbia University, in New York, has been looking into the matter. One of his interests is the optical（光学的）properties of biological materials. That has led him to study butterfly wings in more detail. And, in cooperation with Naomi Pierce, a butterfly specialist at Harvard University, he has now shown, in a paper published this week in Nature Communications, that butterfly wings are, indeed, very much alive.
Initially, Dr Yu and Dr Pierce wanted to know how the insects keep their body temperatures up without their wings overheating.
Unlike birds and mammals, butterflies do not produce enough internal heat to metabolize（新陈代谢）. Instead, they rely on outside heat sources—usually the sun—to bring their bodies up to speed. But their wings, being thin protein membranes（膜）, have a limited thermal capacity. Those wings can therefore overheat quickly if the insects are exposed to the sunlight too long, or, oppositely, can cool down too rapidly if they are flying through cold air.
In their experiments, the two researchers used a laser（激光）to heat up spots on the wings of dozens of butterfly species. When the temperature of the area under the laser reached 40℃ or so, the insects responded within seconds by doing things that stopped their wings heating up further. These actions included a butterfly turning around to minimize its exposure to the laser, beating its wings or simply walking away.
1.What's Dr Yu's discovery about butterfly wings?
A.They contain dead tissue.
B.They are too thin to store heat.
C.They have different functions.
D.They react quickly to high heat.
2.Which of the following is True according to the text?
A.Butterflies metabolize completely with its internal heat.
B.Chemicals from butterfly wings help drive away threats.
C.The color of butterfly's wings keeps fixed.
D.The researchers achieved big in optical properties.
3.How can a butterfly stop its wings overheating?
A.By providing heat itself.
B.By flying through cold air.
C.By removing the source of heat.
D.By adjusting their heating surface.
4.What's the best title for the text?
A.A Research into Butterfly Wings
B.The Jobs of Butterfly Wings
C.Butterfly Wings: Dead or Alive
D.Butterfly Wings Temperature Changes
高三英语阅读理解中等难度题
A butterfly's wings can have many jobs besides keeping the insect in the air. They may be called on to attract mates, to warn potential enemies to stay away, to do other animals or even to provide disguise（伪装）.
All of these roles, though, depend on their colouration—which is unchanging. This plays into the idea that butterfly wings are dead tissue, like a bird's feathers or a mammal's hair. In fact, that is not true. For example, in some species males' wings harbour special cells that release chemicals which attract females.
Nanfang Yu, a physicist at Columbia University, in New York, has been looking into the matter. One of his interests is the optical（光学的）properties of biological materials. That has led him to study butterfly wings in more detail. And, in cooperation with Naomi Pierce, a butterfly specialist at Harvard University, he has now shown, in a paper published this week in Nature Communications, that butterfly wings are, indeed, very much alive.
Initially, Dr Yu and Dr Pierce wanted to know how the insects keep their body temperatures up without their wings overheating.
Unlike birds and mammals, butterflies do not produce enough internal heat to metabolize（新陈代谢）. Instead, they rely on outside heat sources—usually the sun—to bring their bodies up to speed. But their wings, being thin protein membranes（膜）, have a limited thermal capacity. Those wings can therefore overheat quickly if the insects are exposed to the sunlight too long, or, oppositely, can cool down too rapidly if they are flying through cold air.
In their experiments, the two researchers used a laser（激光）to heat up spots on the wings of dozens of butterfly species. When the temperature of the area under the laser reached 40℃ or so, the insects responded within seconds by doing things that stopped their wings heating up further. These actions included a butterfly turning around to minimize its exposure to the laser, beating its wings or simply walking away.
1.What's Dr Yu's discovery about butterfly wings?
A.They contain dead tissue.
B.They are too thin to store heat.
C.They have different functions.
D.They react quickly to high heat.
2.Which of the following is True according to the text?
A.Butterflies metabolize completely with its internal heat.
B.Chemicals from butterfly wings help drive away threats.
C.The color of butterfly's wings keeps fixed.
D.The researchers achieved big in optical properties.
3.How can a butterfly stop its wings overheating?
A.By providing heat itself.
B.By flying through cold air.
C.By removing the source of heat.
D.By adjusting their heating surface.
4.What's the best title for the text?
A.A Research into Butterfly Wings
B.The Jobs of Butterfly Wings
C.Butterfly Wings: Dead or Alive
D.Butterfly Wings Temperature Changes
高三英语阅读理解中等难度题查看答案及解析
Nature is full of color, from rainbows and roses to butterfly wings and peacock tails. Even the fruits and vegetables you eat have different colors: blue blueberries, red strawberries, green broccoli, and orange carrots.
Plant and animals often use color to attract attention. The substances responsible for these colors belong to a class of chemical called antioxidants(抗氧化物). Plants make antioxidant to protect themselves from the sun's ultraviolet(紫外线)light.
Ultraviolet light causes chemicals called free radicals(自由基)to form within plant cells. They can destroy parts of plant. Free radicals also have damaging effects on human beings. Some of these effects like wrinkled skin can be seen. The damage is caused by the free radicals attacking cells in our bodies. Certain cancers and heart disease are linked to free radicals.
Our bodies have natural defences for fighting off free radicals. While we are young, our defences are pretty strong. However, they get weaker as we get older. The body’s built-in defences can only go so far without extra help.
The key to fighting free radicals with fruits and vegetables is to mix and match colors. It’s like sunscreen(防晒霜)for the inside of your body. Go for a range of very bright colors. Colorful foods contain hundreds of healthy chemicals not found anywhere else.
Research into how chemicals in blueberries affect the brain's function in rats suggests that these chemicals may help our own brains work more efficiently.
Don't just blame the sun. Ultraviolet light isn't the only source of free radicals. If you breathe polluted air such as smog, automobile exhaust(废气), or wasted gas from a factory, you take in chemicals that also cause such damage. And, the body itself produces free radicals as it processes food.
1.Which of the following NOT true?
A．Antioxidants are responsible for plant colors.
B．Plants use color to attract attention.
C．Antioxidants help free radicals to attack plants.
D．Antioxidants can protect plants from ultraviolet light.
2.In which order do the following facts occur?
a .Wrinkled skin can be seen
b .Ultraviolet light causes free radicals to form
c .Free radicals damage cells in our bodies
d .The sun gives out ultraviolet light
A．a,b,c,d B．d,b,a,c
C．c,a,d,b D．d,b,c,a
3. We need extra help for fighting off free radicals from fruits and vegetables because ____.
A．our defences get weaker as we get older
B．our bodies’ defences are not natural
C．we are too young to defend ourselves
D．our bodies’ built-in defences can only go away
4.Which of the following can NOT cause free radicals to form?
A．Ultraviolet light from the sun
B．Colorful food
C．Polluted air
D．The body itself
高三英语阅读理解中等难度题查看答案及解析
Today's children are the "result" of the modern society. Our parents have jobs that keep them busy almost all day long. They only have a free day in a week. This doesn't allow them to keep an eye on their children.
On the other hand, the modern society gives more freedom to the children than they could "handle". As a child, you don't know how to grow up by yourself until you reach a certain age. That is why you need school and parents to be by your side all the time. If you don't have either of them you may make a lot of mistakes. The social system of the modem society is very lenient especially with the children.
Most of the children today are rebels(叛逆者). They are rude. They are given too much freedom by their families. This is their parents' mistake. They ought to know that the freedom they give to their children is misunderstood.
For example it is a bad thing for a 17-year-old child to go out in the evening on weekends. Parents are also guilty of the way their children show up in the street or at school. The same guilt belongs to the teaching system as well. Pupils shouldn't be allowed to dress like they were on a fashion presentation at school.
Another important fact we can think of regarding the freedom of children is their free will of spending money. Parents shouldn't allow their children to spend money on whatever they want.
I think children are given too much freedom not only by their parents, but also by the society. The latter is more to be blamed！
1.The writer implies that parents' busy lifestyle .
A. makes their children become independent
B. may lead to a tense parent-child relationship
C. is harmful to their children's health
D. is likely to create a troubled generation
2.What does the underlined word "lenient" ( in Paragraph 2 ) mean ?
A. Not responsible. B. Not strict.
C. Unkind. D. Unfair.
3. It seems that the writer agrees that students .
A. should stay at home on weekends
B. can wear trendy clothes at school
C. had better wear school uniform at school
D. can be allowed to go out in the evenings
4.According to the writer, which of the following takes the primary responsibility for children's problems?
A. The social environment. B. The educational system.
C. Each family. D. The school.
高三英语阅读理解中等难度题查看答案及解析
Today’s children are the “result” of the modern society. Our parents have jobs that keep them busy almost all day long. They only have a free day in a week. This doesn’t allow them to keep an eye on their children.
On the other hand, the modern society gives more freedom to the children than they could “handle”. As a child, you don’t know how to grow up by yourself until you reach a certain age. That is why you need school and parents to be by your side all the time. If you don’t have either of them you may make a lot of mistakes. The social system of the modern society is very lenient especially with the children.
Most of the children today are rebels (判逆者). They are rude. They are given too much freedom by their families. This is their parent’s mistake. They ought to know that the freedom they give to their children is misunderstood.
For example it is a bad thing for a 17 – year – old child to go out in the evening on weekends. Parents are also guilty of the way their children show up in the street or at school. The same guilt belongs to the teaching system as well. Pupils shouldn’t be allowed to dress like they were on a fashion presentation at school.
Another important fact we can think of regarding the freedom of children is their free will of spending money. Parents shouldn’t allow their children to spend money on whatever they want.
I think children are given too much freedom not only by their parents, but also by the society. The latter is more to be blamed!
1.The writer implies that parents’ busy lifestyle ________.
A．makes their children become independent
B．may lead to a tense parent – child relationship
C．is harmful to their children’s health
D．is likely to create a troubled generation
2.What does the underlined word “lenient” (in Para 2) mean?
A．Not responsible B．Not strict. C．Unkind. D．Unfair.
3.It seems that the writer agrees that students ________.
A．should stay at home on weekends
B．can wear trendy clothes at school
C．had better wear school uniform at school
D．can be allowed to go out in the evenings
4.According to the writer, which of the following takes the primary responsibility for children’s problems?
A．The social environment. B．The educational system.
C．Each family. D．The school.
高三英语阅读理解中等难度题查看答案及解析
Companies that employ workers have an interest in keeping the workplace safe.Job-related injuries are something that responsible employers avoid.They take the time and use company resources to make sure that the people who come to work each day are safe.
Not only does this make good sense from a moral standpoint,but it also makes good financial sense.If a worker is injured on the job,it costs the company in terms of lost mam tours,increased insurance costs,worker’s compensation premiums（赔偿金）,and legal posts.
Productivity is lost when other workers have to stop doing their jobs to deal with the situation.Even after the injured worker has been sent home or taken to hospital,other employees may be unfocused or need to take time off from work in the result of the incident.
When a workplace is safe,workers feel more comfortable and confident when they are in that environment. Productivity gets a promotion,and profits follow suit.Absence also drops when employers take steps to carry out an effective safety program.
Investing in a good safety program brings with it other benefits too.When employees feel safe in the workplace and absence rates are kept down,they can focus on serving the company’s customers properly.Many companies offer produces or services that are similar to those that other companies carry or provide.Customers will decide which companies they want to deal with based on which one they feel provides the best customer service.Increased absence means longer wait times and customers are quite prepared to move on to another company they feel will be able to help them in a more timely manner if they are not getting the level of attention that they deserve.
Everyone in the workplace has a duty and a responsibility to do whatever they can to keep the working environment safe.Managers should deal with employee concerns about safely issues in an appropriate manner.
1.What bad effect does an incident have according to the text?
A. Workers may refuse to work again.
B. The quality of products may decline.
C. Workers may be hard to concentrate.
D. The company may close down.
2.What do we know about the safe workplace form Paragraph 4?
A. It can inspire workers’ creativity.
B. It can bring workers a higher pay.
C. It can put an end to worker’ absence.
D. It can bring the employer more money.
3.On what condition will the customers move on to another company according to the text?
A. If they can’t get a safer product.
B. If they have to wait for a long time to get deserved attention.
C. If they feel the company can’t provide a safer workplace for them.
D. If they find the company provides the some products as others offer.
4.Which of the following can be the best title of the text?
A. How Employees Can Protect Themselves
B. Companies Are Ensuring Employees’ Safety
C. Why Safety Is Important in the Workplace
D. How to Create a Safer Workplace
高三英语阅读理解中等难度题查看答案及解析
Much disappointed as he is in the job interview, he still keeps his confidence.
A. to have failed B. failed
C. having failed D. failing
高三英语单项填空中等难度题查看答案及解析
Much disappointed as he is in the job interview, he still keeps his confidence.
A. to have failed B. failed
C. having failed D. failing
高三英语单项填空中等难度题查看答案及解析
Much disappointed as he is ____ in the job interview, he still keeps his confidence.
A.to have failed B.to fail C.having failed D.failing
高三英语单项填空困难题查看答案及解析
Much disappointed as he is in the job interview, he still keeps his confidence.
A.to have failed B.failed
C.having failed D.failing
高三英语单项填空中等难度题查看答案及解析
Much disappointed as he is _______ in the job interview, he still keeps his confidence.
A． to have failed B． failed
C． having failed D． failing
高三英语单项填空中等难度题查看答案及解析