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(chǎn) 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 本文屬于說(shuō)明文閱讀，作者通過(guò)這篇文章主要向我們描述了人類所擁有的看到立體圖象的能力，人類的眼睛就像照相機(jī)，相互靠近一起工作，才能看到立體的圖象．

解答 67．A．細(xì)節(jié)理解題．根據(jù)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"可知眼睛和相機(jī)都可以記錄圖象；故選A．
68．C．細(xì)節(jié)理解題．根據(jù)文章第三段"Seeing in stereo means seeing with two eyes working together，which is called stereoscopic sight"可知立體視覺(jué)是眼睛彼此靠近，一起工作的結(jié)果；故選C．
69．C．詞義推斷題．根據(jù)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"如果圖象是來(lái)自一只眼睛，然而，只有這兩個(gè)尺寸的高度和寬度可以被感知；可知詞義為被看到；故選C．
70．B．推理判斷題．根據(jù)文章最后一段"Besides，what if you needed glasses？Be glad for the  eyesight that you have"可知作者認(rèn)為看立體圖象是一種人類幸運(yùn)的擁有的能力；故選B．

點(diǎn)評(píng) 考察學(xué)生的細(xì)節(jié)理解和推理判斷能力，做細(xì)節(jié)理解題時(shí)一定要找到文章中的原句，和題干進(jìn)行比較，再做出正確的選擇．在做推理判斷題不要以個(gè)人的主觀想象代替文章的事實(shí)，要根據(jù)文章事實(shí)進(jìn)行合乎邏輯的推理判斷．

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