13．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（雙眼的） 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．
67．According to the passage，the similarity of an eye and a camera is that they bothB．
A．can imagine objects              
B．can record images
C．provide centered images          
D．work at the same height
68．Stereoscopic sight is a result of havingA．
A．two eyes close to each other that work together
B．hundreds of eyes，all seeing tiny parts of an image
C．a(chǎn) three-hundred-sixty-degree field of sight
D．one eye on either side of the head，each seeing a different image
69．What is the meaning of the underlined word"perceived"in Para3 most similar to？B
A．known         B．seen         C．taken            D．understood
70．We can infer from the last paragraph thatD．
A．our eyes work like cameras
B．a(chǎn)nimal 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．

分析 本文是一篇說明文，主要講述了人類的眼睛是如何看世界的．人類的眼睛就像兩個小型照相機(jī)，首先捕獲到物體，然后記錄視網(wǎng)膜上，兩只眼睛從同一高度的不同的角度看物體，看到的物體就是三維立體的．

解答 67-70．BABD
67題答案：B細(xì)節(jié)理解題．根據(jù)文章第二段內(nèi)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．（相機(jī)能捕捉到圖象并將其記錄到膠卷中，類似地當(dāng)你看著物體的時候每只眼睛都會捕捉到它說看到的然后將其送到眼球的后部）．可知眼睛和照相機(jī)的共同特點是能夠記錄影像，故選B．
68題答案：A考查細(xì)節(jié)推理，根據(jù)文章第三段內(nèi)容Seeing in stereo means seeing with two eyes working together，which is called stereoscopic sight．（立體視覺意味著用兩只眼睛一起看--這被稱作立體視覺）．可知答案選A．
69題答案：B考查細(xì)節(jié)推理，文章第三段介紹了兩只眼睛看物體的話是三維立體的，而一只眼睛看的世界就是二維的，由此推斷該詞意為"see"，選B．
70題答案：D考查細(xì)節(jié)推理，文章末段對比了人類的眼睛和其他動物的眼睛，根據(jù)Be glad for the eyesight that you have．（有幸擁有你的視力）．可以判斷作者認(rèn)為人類擁有這樣的眼睛是幸運的，選D．

點評 本文是一篇科教類閱讀，題目涉及多道細(xì)節(jié)理解題，做題時結(jié)合原文和題目有針對 性找出相關(guān)語句進(jìn)行仔細(xì)分析，結(jié)合選項選出正確答案．推理判斷也是要在抓住關(guān)鍵句子的基礎(chǔ)上合理的分析才能得出正確的答案．

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