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    20．Seeing in Stereo
    Have you wondered why you have two eyes and why they are set close together on the front of your face？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（影像）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 objeets 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 this 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 180degrees wide，which is called binocular sight．On the other hand，animals that are hunted have eyes on the sides of the head，which  Drovides nearly 360-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 tinv insect eye sees only a tiny part．Besides，what if you needed glasses？Be glad for the  eyesight that you have．

    67．According to the passage，an eye is like a camera because bothA
    A．can record images           B．can imagine objects
    C．provide centered images     D．work at the same height
    68．Stereoscopic sight is a result of havingC
    A．a three-hundred-sixty-degree field of sight
    B．hundreds of eyes，all seeing parts of an image
    C．two eyes close to one another that work together
    D．one eye on either side of the head，each seeing a different image
    69．The underlined word"perceived''in Paragraph 3meansC
    A．set    B．taken    C．seen    D．understood
    70．The author implies that"seeing in stereo"B
    A．is similar to the way cameras work
    B．is an ability humans are fortunate to have
    C．would be better for a wider field of sight
    D．helps people to havelbetter sight than animals．

    分析 本文属于说明文阅读，作者通过这篇文章主要向我们描述了人类所拥有的看到立体图象的能力，人类的眼睛就像照相机，相互靠近一起工作，才能看到立体的图象．

    解答 67．A．细节理解题．根据文章第二段"Your eyes are like two small cameras．A camera catches an image（影像）of an object and records it on film"可知眼睛和相机都可以记录图象；故选A．
    68．C．细节理解题．根据文章第三段"Seeing in stereo means seeing with two eyes working together，which is called stereoscopic sight"可知立体视觉是眼睛彼此靠近，一起工作的结果；故选C．
    69．C．词义推断题．根据文章第三段"If images are coming from only one eye，however，only two of these dimensions-height and width-can be perceived"如果图象是来自一只眼睛，然而，只有这两个尺寸的高度和宽度可以被感知；可知词义为被看到；故选C．
    70．B．推理判断题．根据文章最后一段"Besides，what if you needed glasses？Be glad for the  eyesight that you have"可知作者认为看立体图象是一种人类幸运的拥有的能力；故选B．

    点评 考察学生的细节理解和推理判断能力，做细节理解题时一定要找到文章中的原句，和题干进行比较，再做出正确的选择．在做推理判断题不要以个人的主观想象代替文章的事实，要根据文章事实进行合乎逻辑的推理判断．

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