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Having two eyes, instead of one, is particularly useful for ______.
A. seeing at night
B. seeing objects far away
C. looking over a wide area
D. judging distances
答案
更多“Having two eyes, instead of one, is particularly useful for ______. A. seeing at”相关的问题
第1题
People who are near-sighted can only see things that are very close to their eyes.' Everything else is not so clear. Many people who do a lot of close work, such as writing, reading and sewing, become near sighted. Then they have to wear glasses in order to see distant (远处的) things clearly.
People who are far-sighted suffer from just the opposite problem. They can see things that are far away, but they have difficulty in reading a book unless they hold it at arm's length. If they want to do much reading, they must get glasses, too.
Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism (散光). This, too, can be corrected by glasses. Some people's eyes become cloudy because of cataracts (白内障). Long ago these people often became blind. Now, however, it is possible to operate on the cataracts and remove them."
Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle (角度). To prove this to yourself, look at an object out of one eye; then look at the same object out of the other eye. You will find the object's relation to the background (背景) and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.
We should take good care of our eyes ______.
A．only when we cannot see perfectly
B．only when we can see well
C．even if we can see well
D．only when we realize how important our eyes are
第2题
When we see well, we do not think about our eyes very often. (79) It is only when we cannot see perfectly that we realize how important our eyes are.
People who are nearsighted can only see things that are very close to their eyes. Everything else seems blurry (模糊的). Many people who do a lot of close work, such as writing, reading and sewing, become nearsighted. Then they have to wear glasses in order to see distant objects clearly.
People who are farsighted suffer from just the opposite problem. They can see things that are far away, but they have difficulty in reading a book unless they hold it at arm's length. If they want to do much reading, they must get glasses, too.
Other people do not see clearly because their eyes are not exactly the right shape. They have what is called astigmatism (散光). This, too, can be corrected by glasses. Some people's eyes become cloudy because of cataracts (白内障). Long ago these people olden became blind. Now, however, it is possible to operate on the cataracts and remove them.
Having two good eyes is important for judging distances. Each eye sees things from a slightly different angle. To prove this to yourself, look at object out of one eye; then look at the same object out of your other eye. You will find the object's relation to the background and other things around it has changed. The difference between these two different eye views helps us to judge how far away an object is. People who have only one eye cannot judge distance as people with two eyes.
We should take good care of our eyes ______.
A．only when we can see well
B．only when we cannot see perfectly
C．even if we can see dell
D．only when we realize how important our eyes are
第3题
After【23】for some time, they saw a farm house. When they【24】the house, they found a farmer and his wife having supper. They were asked to sit down and【25】too. As they were very hungry, they did so with【26】
While eating his supper the farmer kept his eyes on the plate without saying【27】. This made the travelers a little afraid. After supper the farmer's wife【28】them up to a store room, and showed them a【29】where they could sleep. Being【30】, they soon book off their clothes and went to bed. But the younger traveler was too【31】to go to sleep. He heard the farmer and his wife talking in the room in a【32】voice. At first he couldn't hear any words, but then he【33】heard the husband say, "Must we kill them both？" and the wife replied, "Yes, of course we must." A moment later, he again heard the farmer【34】into the room, so he quickly【35】behind the door. The door slowly【36】, and the farmer came in with a light in one hand and a long knife in the other. He went to the【37】hanging on the wall, cut off a piece, and returned as【38】as he had come. The two travelers didn't dare to go to【39】. Early in the morning they began to【40】in the dark through the kitchen, finding on the table a piece of meat cleaned and two chicks killed.
(61)
A．know
B．found
C．saw
D．heard
第4题
A.It has a big nose and two big eyes
B.It has a big nose and two big ears
C.It has a big mouth and two big eyes
第5题
Having waited in the waiting room for two hours, he became ______.
A．patient
B．impatient
C．patience
D．impatience
第6题
A.Having worked
B.Working
C.Worked
D.Being worked
第7题
A.have; bought
B.did; buy
C.have; had
D.are; having
第8题
A.Seen her two sisters-in-law off
B.Having seen her two sisters-in law off
C.With her two sisters-in-law seen off
D.By seeing her two sisters-in-law off
第9题
B. how to tell the differences between an executive and a visitor
C. how to tell businessmen at a glance
D. how businessmen indicate status
Which of the statements can best sum up the passage？A.The executive has a higher status than the visitor
B.Military people wear uniforms but the businessmen do not
C.A study revealing a set of rules about the status of businessmen
D.It is a good method to use a series of silent film in research
The longer the seated man was in answering the knock, __________ .A.the higher his status
B.the less it affected his status
C.the lower his status
D.the more it affected his status
Having entered the room, the closer the visitor approaches the executive, __________ .A.the less it affected his status
B.the lower his status
C.the more it affected his status
D.the higher his status
Which statement is NOT true？A.Soldiers wear uniforms with various symbols so that one can tell their status at a glance
B.In the experiment, one actor played the executive while the other played the seated man
C.Business people wear similar suits
D.The audience watching the film rated the executive and the visitor in terms of status
请帮忙给出每个问题的正确答案和分析，谢谢！
第10题
An owl(猫头鹰) is a bird. There are two basic types of owls: typical owls and barn owls. Owls live in almost every country of the world.
Owls are mostly nocturnal, meaning they are awake at night. Owls are predators——they hunt the food that they eat. Owls hunt for mice and other small mammals, insects, and even fish. Owls are well adapted for hunting. Their soft feathers make their flight nearly silent. They have very good hearing, which helps them to hunt well in the darkness. The sharp hooked beaks and claws of the owl make it very easy to tear apart prey quickly, although owls also eat some prey whole.
Owl eyes are unusual. Like most predators, both of the owl's eyes face front. The owl cannot move its eyes. Owls are far-sighted, which means they can see very well far away, but they can't see up close very well at all. Fortunately, their distant vision is what they use for hunting, and they can see far away even in low light.
Owl can turn their heads 180 degrees. This makes it look like they might be able to turn their heads all the way around, but 180 degrees is all the owl needs to see what's going on all around him.
(66) Perhaps because of the owl's mysterious appearance, especially its round eyes and flexible neck, there are a lot of myths and superstitions (迷信) about owls. Many cultures believe that owls are unusually wise. Because owls are nocturnal, some cultures associate owls with bad omens. However, owls probably do not interact with the fates of humans at all. In fact, some owl species may become extinct because of humans.
Which of the following is NOT true about owls？
A．Owls eat small animals.
B．Owls are able to fly silently.
C．Owls have very poor vision.
D．Owls have flexible necks.
