Question

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

 

Answer 1

1.B

2.A

3.B

4.D

【解析】

试题分析:本文是一篇说明文，主要讲述了人类的眼睛是如何看世界的。人类的眼睛就像两个小型照相机，首先捕获到物体，然后记录视网膜上，两只眼睛从同一高度的不同的角度看物体，看到的物体就是三维立体的。

1.细节理解题。根据文章第二段内容 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.可知眼睛和照相机的共同特点是能够记录影像，故选B。

2. 细节理解题。根据文章第三段内容Seeing in stereo means seeing with two eyes working together, which is called stereoscopic sight.可知答案选A。

3.词义猜测题。文章第三段介绍了两只眼睛看物体的话是三维立体的，而一只眼睛看的世界就是二维的，由此推断该词意为“see”，选B。

4. 推理判断题。文章末段对比了人类的眼睛和其他动物的眼睛，根据Be glad for the eyesight that you have.可以判断作者认为人类拥有这样的眼睛是幸运的，选D。

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