(2013·高考四川卷)—Why are your eyes so red? You___...

(2013·高考四川卷)—Why are your eyes so red? You________have slept well last night.

—Yeah，I stayed up late writing a report.

A. can’t　　 B. mustn’t

C. needn’t　　 D. won’t

高二英语单项填空中等难度题查看答案及解析

You have two eyes and they are set close together on the front of your face. Have you wondered why? The reasons are simple and important to the way you see the rest of your world.

Your eyes are like two small cameras. A camera catches an image of an object and records it on film. Similarly, when you look at something, each eye takes in what it sees and sends this image to the back of the eyeball. Because your eyes are set close together, they view the world from about the same height but from slightly different angles. Working as a team, the eyes send the images to your brain, which puts them together into a single, centered image.

Seeing in stereo means seeing with two eyes working together, which is called stereoscopic sight. This allows you to view the world in three dimensions, or 3-D. Seeing depth helps you to judge the distance between you and the objects you see and to adjust to the changing angle at which you see something as you move closer to or farther away from it. If images are coming from only one eye, however, only two of these dimensions----height and width----can be perceived. A world seen with one eye is thus two-dimensional, as in a photograph.

Now consider why your two eyes are on the front of your face. Think of other animals with the same arrangement. They are all animals that hunt, like lions and wolves. Their eyes face directly in front of them. This provides a field of sight about 180 degrees wide, which is called binocular(双眼的) sight. On the other hand, animals that are hunted have eyes on the sides of the head, which provides nearly360-degree field of sight. In order to stay alive, they need to see things coming from the sides and from behind. However, without stereoscopic sight, they have difficulty determining how far a danger is.

With sight both stereoscopic and binocular, humans share with animal hunters the ability to see from side to side and to accurately determine the distance. If you think it would be great to have another type of sight, perhaps with hundreds of tiny eyes like many insects do, think again! Each tiny insect eye sees only a tiny part. Besides, what if you needed glasses? Be glad for the eyesight that you have.

1.According to the passage, the similarity of an eye and a camera is that they both　　　　　　　 .

A. can imagine objects　　　　　　 　 B. can record images

C. provide centered images　　　　 　 D. work at the same height

2.Stereoscopic sight is a result of having　　　　　　　　　 .　

A. two eyes close to each other that work together

B. hundreds of eyes, all seeing tiny parts of an image

C. a three-hundred-sixty-degree field of sight

D. one eye on either side of the head, each seeing a different image

3.What is the meaning of the underlined word “perceived” in Para3 most similar to?

A. known　　 　 B. seen　　 　 C. taken　　 　 D. understood

4.We can infer from the last paragraph that　　　　　　　　 .

A. our eyes work like cameras

B. animal hunters are glad for the sight they have

C. the three dimensions are depth, height and width

D. human beings are fortunate to have such eyesight

高二英语阅读理解中等难度题查看答案及解析

Have you ever complained why life is so tiring? Does the sky sometimes seem dark to you? Are your studies sometimes not successful? Well, friends, cheer up and smile all the time. If you see the world with your warm heart, you’ll find that the whole world smiles to you.

While in school, sometimes you are tired of your lessons, but have you ever noticed the happy smile on your teacher’s face when you did a good job?

One day it is fine. Just before you go out, it suddenly starts to rain. Maybe you would feel very sad and start to complain about the weather. But dear friends, why don’t you sit down and listen to the free concerts that the nature offers you? And with the timely rain, crops in the fields will grow better and better and farmers will have a good harvest.

Although everyone wants to succeed in what he tries to do, sometimes failure can’t be avoided. I think failure is not terrible, and the terrible thing is that we are afraid of it and give up hope. When we face failure, we must be confident in ourselves, draw a useful lesson from it and try our best to finish what we have decided to do. As a popular saying goes, “Failure is the mother of success”.

Attitude decides everything. With an optimistic attitude life is easy and pleasant. Let’s smile to whatever we meet and the whole world will smile to us.

1.People sometimes complain _________.

A. the sky is always dark

B. their studies are successful

C. they see the world with their heart

D. life is tiring

2.When we face failure, we ___________.

A. must be confident in ourselves

B. shouldn’t be afraid of it

C. shouldn’t give up hope

D. All of the above

3.The best title for the passage is_______.

A. Smile and the World Smiles to You

B. Complaining about Life

C. Failure is the Mother of Success

D. It is Very Hard to Succeed

高二英语阅读理解中等难度题查看答案及解析

Tom, you _______ to watch the singing program named I’m a Singer last night, for your eyes are red.

A. could stay up 　　　　 B. can have stayed up

C.must have stayed up　　 D.should stay up

高二英语单项填空中等难度题查看答案及解析

—You seem to have lost your way.______

—I’m looking for Buck’s Cottages.

A．Why so?          B．What are you looking for?                 C．Need help? D．Where are you from?

高二英语单项填空中等难度题查看答案及解析

Have you ever wondered why there are so many skin colors in the world? Do you know why people living in particular areas usually have a certain color? Biology and history are the two reasons for this.

Skin contains something called melanin, which determines a person’s skin color. The more melanin a person has, the darker his or her skin will be. The amount of and the production of melanin are controlled by genetics, but can be affected by other things, such as sunlight. If a person lives in a place with less sunlight, a person’s body will produce less melanin, making the skin lighter.

Skin color is also affected by another source ---- vitamin D. humans all need vitamin D to build bones. People can get it by eating foods such as fish and milk, or from sunlight, so sunlight absorbed by melanin cannot be used for vitamin D production. Therefore, a dark—skinned person will produce less vitamin D than a light—skinned person when they received the same amount of sunlight.

The connection between vitamin D production and skin color is clear when we look at evolution. The earliest humans lived in Africa, their dark skin produced less vitamin D because of their dark skin. As a result, their skin made less melanin, so they could get enough sunlight to produce vitamin D. their skin gradually got lighter and they lost hair. Now, people living in areas with strong sunlight like Africa, have darker skin, while people living in other areas have lighter skin. The exception to this is the Inuit, who live in a place with little sunlight, but have dark skin because they eat a lot of fish and have enough vitamin D.

Evolution has given us a rainbow of skin colors. Humans have always had melanin to determine our skin color. What has changed through history is the environment where we have lived. This has in turn changed our melanin production, and eventually, skin color.

高二英语其他题中等难度题查看答案及解析

Have you ever wondered why there are so many skin colors in the world? Do you know why people living in particular areas usually have a certain color? Biology and history are the two reasons for this.

Skin contains something called melanin, which determines a person’s skin color. The more melanin a person has, the darker his or her skin will be. The amount of and the production of melanin are controlled by genetics, but can be affected by other things, such as sunlight. If a person lives in a place with less sunlight, a person’s body will produce less melanin, making the skin lighter.

Skin color is also affected by another source ---- vitamin D. humans all need vitamin D to build bones. People can get it by eating foods such as fish and milk, or from sunlight, so sunlight absorbed by melanin cannot be used for vitamin D production. Therefore, a dark—skinned person will produce less vitamin D than a light—skinned person when they received the same amount of sunlight.

The connection between vitamin D production and skin color is clear when we look at evolution. The earliest humans lived in Africa, their dark skin produced less vitamin D because of their dark skin. As a result, their skin made less melanin, so they could get enough sunlight to produce vitamin D. their skin gradually got lighter and they lost hair. Now, people living in areas with strong sunlight like Africa, have darker skin, while people living in other areas have lighter skin. The exception to this is the Inuit, who live in a place with little sunlight, but have dark skin because they eat a lot of fish and have enough vitamin D.

Evolution has given us a rainbow of skin colors. Humans have always had melanin to determine our skin color. What has changed through history is the environment where we have lived. This has in turn changed our melanin production, and eventually, skin color.

高二英语阅读理解中等难度题查看答案及解析

—Why are you crying? Today is your birthday!

—_______. I am so excited with so many friends surrounding me.

A. None of your business　　 B. Don’t mention it

C. Just can’t help it　　　 D. That’s all right

高二英语单项填空中等难度题查看答案及解析

—Why are you crying? Today is your birthday!

—____________. I am so excited with so many friends surrounding me.

A. Just can’t help it                            B. Don’t mention it

C. None of your business                    D. That’s all right

高二英语单项填空简单题查看答案及解析

—Why are you crying? Today is your birthday!

—____________. I am so excited with so many friends surrounding me.

A. Just can’t help it                            B. Don’t mention it

C. None of your business                    D. That’s all right

高二英语单项填空中等难度题查看答案及解析