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Are your eyes irritated, dry, watery, blurry, seeing double or sensitive to light, and do your back and neck ache? If so, you are likely one of many people today who suffer from digital eyestrain, also called computer-vision syndrome.
Eyestrain is often related to the amount of exposure to screens, the distance from eyes to screens and the use of multiple screens simultaneously. However, studies have also shown that the blue light produced by digital devices today reaches further into the eyes than other kinds of light. This light actually assists attention during the day but can result in interrupted sleep patterns at night.
Scientists have also said that eyestrain is not a necessary evil, even in a modern world that revolves around technology. Changing some simple details about your relative position to screens, such as staying about 60 centimeters away, will help. Also, avoid overhead and other direct sources of light, and use shaded lamps and window blinds while looking at digital devices instead.
Beyond the way that relates to digital screens, there are also ways to change how you view screens that are helpful in combating eyestrain. To begin with, your computer screen should be high-resolution(高清的), at least 50 centimeters wide diagonally and may require a screen filter to decrease reflections. Also, be aware that “computer glasses”, which cut down glare and blue light, are available and those contact lenses can increase the risk of eyestrain.
Besides, to reduce your risk for computer-vision syndrome and neck, back and shoulder pain, take frequent breaks during your computer workday. Many workers take only two 15-minute breaks from their computer throughout their day. According to a recent study, discomfort and eyestrain are significantly reduced when computer workers take four additional five-minute “mini-breaks” throughout their workday. And these additional breaks don’t reduce the workers’ productivity.
Finally, many of us fall into bad habits while using digital screens that only worsen the effects of eyestrain. While viewing digital screens, many people blink one third less often than they usually do. Place a reminder on your computer to “blink” so that your eyes don’t dry out. Also, rest your eyes’ focusing muscles by using the 20-20-20 rule: Every 20 minutes, focus on something 20 feet away for 20 seconds.
1.What is Paragraph 2 mainly about?
A. The dangers of eyestrain. B. The causes of eyestrain.
C. The symptoms of eyestrain. D. The effects of eyestrain.
2.Which of the following ways might not be helpful in relieving eyestrain?
A. Employing blue light. B. Breaking bad habits.
C. Adjusting your position. D. Changing your hardware.
3.It can be inferred from the passage that_______ .
A. overhead lights make the eyes less tired
B. taking frequent breaks reduces eyestrain
C. people tend to blink more often at a computer
D. technology and eyestrain unavoidably go hand in hand
4.Which of the following shows the structure of the passage?
A. 
B. 
C. 
D. 
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Are your eyes irritated, dry, watery, blurry, seeing double or sensitive to light, and do your back and neck ache? If so, you are likely one of many people today who suffer from digital eyestrain, also called computer-vision syndrome.
Eyestrain is often related to the amount of exposure to screens, the distance from eyes to screens and the use of multiple screens simultaneously. However, studies have also shown that the blue light produced by digital devices today reaches further into the eyes than other kinds of light. This light actually assists attention during the day but can result in interrupted sleep patterns at night.
Scientists have also said that eyestrain is not a necessary evil, even in a modern world that revolves around technology. Changing some simple details about your relative position to screens, such as staying about 60 centimeters away, will help. Also, avoid overhead and other direct sources of light, and use shaded lamps and window blinds while looking at digital devices instead.
Beyond the way that relates to digital screens, there are also ways to change how you view screens that are helpful in combating eyestrain. To begin with, your computer screen should be high-resolution(高清的), at least 50 centimeters wide diagonally and may require a screen filter to decrease reflections. Also, be aware that “computer glasses”, which cut down glare and blue light, are available and those contact lenses can increase the risk of eyestrain.
Besides, to reduce your risk for computer-vision syndrome and neck, back and shoulder pain, take frequent breaks during your computer workday. Many workers take only two 15-minute breaks from their computer throughout their day. According to a recent study, discomfort and eyestrain are significantly reduced when computer workers take four additional five-minute “mini-breaks” throughout their workday. And these additional breaks don’t reduce the workers’ productivity.
Finally, many of us fall into bad habits while using digital screens that only worsen the effects of eyestrain. While viewing digital screens, many people blink one third less often than they usually do. Place a reminder on your computer to “blink” so that your eyes don’t dry out. Also, rest your eyes’ focusing muscles by using the 20-20-20 rule: Every 20 minutes, focus on something 20 feet away for 20 seconds.
1.What is Paragraph 2mainlyabout?
A. The dangers of eyestrain. B. The causes of eyestrain.
C. The symptoms of eyestrain. D. The effects of eyestrain.
2.Which of the following ways might not be helpful in relieving eyestrain?
A. Employing blue light. B. Breaking bad habits.
C. Adjusting your position. D. Changing your hardware.
3.It can be inferred from the passage that .
A. overhead lights make the eyes less tired
B. taking frequent breaks reduces eyestrain
C. people tend to blink more often at a computer
D. technology and eyestrain unavoidably go hand in hand
4.Which of the following shows the structure of the passage?
A. 
B. 
C. 
D. 
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You open your eyes and mouth wide if you see a live rat in your bedroom but you wrinkle your nose and narrow your eyes if you see a dead one in the road. Why is that? Facial expressions are usually thought of as simple tools of communication. But in his book The Expression of the Emotions in Man and Animals, Charles Darwin proposed that they may prepare us to react to different situations when he noticed that some expressions seemed to be used across cultures and even species. Now Joshua Susskind and his colleagues at the University of Toronto, Canada, have put that idea to the test.
Susskind’s team wondered whether the expressions of fear might improve how sensory (感官的) information is acquired and so sharpen senses. Conversely disgust (厌恶) might weaken the senses, sheltering us from unpleasant sights and smells.
The researchers asked volunteers to complete various tests while holding a fearful, disgusted or neutral expression. In one test, they had to identify when a spot entered their sight. In another they were required to shift their focus as quickly as possible between two targets on a computer screen. It was also measured how much air the volunteers breathed in while expressing fear and disgust.
In each case the wide-eyed faces let significantly more of the world in. Volunteers with wide-open eyes detected surrounding objects more quickly and performed side-to-side eye movements faster. They also took in more air with each breath without any extra effort. An MRI (核磁共振) scan showed the nasal cavity (鼻腔) was enlarged while volunteers held this expression, which could be linked with a greater ability to absorb smells.
“These changes confer the idea that fear, for example, is a posture towards sensory sharpening while disgust a posture towards sensory rejection,” says Susskind. His team is already at work on experiments to explore to what extent the brain can use this extra information to enhance performance.
1.Charles Darwin’s book proposed that facial expressions might _____.
A. act as a simple tool of communication
B. get people ready to the changes of circumstances
C. be difficult to understand in different cultures
D. equip people with the knowledge of other species
2.In Joshua Susskind’s research, the researchers _____.
A. wondered whether there existed other expressions of fear
B. wanted subjects to use facial expressions to complete tests
C. wanted to test how much air subjects breathed in normally
D. wondered whether expressions of disgust weakened our senses
3.The underlined sentence in Paragraph 4 means that _____.
A. wide-eyed expressions would help you understand the world better
B. facial expressions might result in faster eye movements
C. wide-eyed expressions would help people breathe in more air
D. facial expressions might help people notice more things around
4.In the last paragraph, what might be the new thinking of facial expressions?
A. They might tell the brain how to make use of the facial information.
B. They might explain why people consider fear as a posture towards sharper senses.
C. They might provide extra information to brains thus enhancing performance.
D. They might clarify the relationship between brain and environments.
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----I can’t see the words on the blackboard clearly.
----Why, your eyes need _____. Perhaps you need ______ glasses.
A. examining; wearing B. to examine; wearing
C. to be examined; to wear D. examined; wearing
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(D)
You can not see any object unless light from that object gets into your eyes. Some of the things you see give off light of their own. The sun, the stars, a lighted lamp are examples that can be seen by their own light. Such things are luminous. Most of the things you see are not giving off light of their own. They are simply reflecting light that falls on them from the sun or some other luminous bodies. The moon, for example, does not give off any light of its own. It is non-luminous. You see it because sunlight falls on it and some of it reflects in our direction. So moon light is only second hand sunlight.
When you look at a book, it sends to your eyes some of the light which falls on it, and you see the book. If light could be kept out from where you are so that there would be no light for the book to reflect, then you could not see the book even with your eyes wide open.
Light travels so fast that the time in which it travels from the book you are reading to your eyes is so short as if there were no time at all. Light reaches us from the moon, which is about 380 000 kilometers away, in only a little more than a second.
1.You can see the book because_______.
A．your eyes are close to it B．it reflects some of the sunlight
C．it has light of its own D．your eyesight can get to it
2.The underlined word “luminous” means_______.
A．visible B．all colors C．giving off light D．sunlight
3.________ have light of their own.
A．The sun and the moon B．The stars and the earth
C．The sun and the stars D．The moon and the earth
4.Which of the following is true?
A．All the things you can see give off light.
B．Light from the book is much shorter than that from the moon.
C．The moment you open your eyes the light from the book travels to your eyes.
D．Light travels so fast that there is no time for you to read.
5.This article is probably from _________ .
A．a science magazine B．a medical magazine
C．a biography D．a story book.
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.You can’t see through the telescope until it ______ to your eyes.
A. contributed B. guaranteed good C. is similar D. is adjusted to
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. It is only when we cannot see clearly _____ we come to see ______ important our eyes are.
| A．that; what | B．which; what | C．that; how | D．which; how |
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It is only when we cannot see clearly _____ we come to see ______ important our eyes are.
A. that; what B. which; what C. that; how D. which; how
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Although cats can’t see in complete darkness, their eyes are much more__________to light than human eyes.
A.impressive B.suitable C.sensitive D.available
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Although cats can’t see in complete darkness, their eyes are much more__________to light than human eyes.
| A．impressive | B．suitable | C．sensitive | D．available |