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5.A new set of images(图象),by Dr,Kettering,tries to tell differences between cat vision and human vision.Whereas humans are able to see more bright colors during the day,their cats have the advantage when it comes to night vision.
Cats have a wider field of view-about 200degrees,compared with humans; 180-degree view,Cats are also better at finding a mouse or toy moving in the corner because of a greater peripheral vision(周边视觉)
Cats are active at dawn and dusk.That may be why they need such good night vision,their eyes have six to eight times more rod cells,which are more sensitive to low light,than humans,do Their extra rod cells also allow cats to sense movement in the dark much better than their human companions can,In addition,cats'special eye lenses(目镜)shape can help gather more light as well.
But cats don't have the advantage in all areas,"Humans have 10to 12times better motion detection (移动侦测)in bright light than the cat,since bright-light vision is a cone function(视锥细胞功能)",kettering said.
Humans also have three types of cones,allowing them to see a broad range of colors,with sensitivity peaks at red,green and blue,While cats may have three types of cones,the number and distribution of each type varies,In behavioral tests,cats don't seem to see the full range of colors that most humans do.
Humans can see objects clearly at 100to 200feet (30to 60meters)away,but cats need to be no more than about 20feet (6m) away to see those same things sharply,And because cats lack the muscles necessary to change the shape of their eye lenses,they can't see things clearly quited as close as humans can and need to be further wasy,Kettering said.

51、How did kettering carry out the research?A
A、by studying some pictures
B、By doing a survey  among cats
C、By asking people some questions
D、By measuring their sight degrees
52、Cats can spot a moving object in the corner becauseD
A、they have a narrower range of view
B、they move vary faster that the objects
C、they are good at catching mouse
D、they have a greater peripheral vision
53、Compared with cats'eyes,B
A、human eyes are more sensitive
B、human eyes have less rod cells
C、human eyes are good at sensing movement
D、human eyes can gather more light
54、Which of the following statements is true?C
A、Cats'eves are superior to humans;
B、Humans are better at detecting directions
C、Humans'eyes can see more colors
D、Cats can see full range of colors
55、We can learn from the last paragraph thatD
A、cats are nearsighted at night
B、cats can change their eye shape easily than humans
C、cats don't need to see things from far away
D、human eyes can adapt to a greater range of distance than cats.

分析 本文为科教文,文章主要介绍了猫的眼睛的特殊之处,并与人眼作对比.

解答 51---55 ADBCD
51.答案A.细节理解题.根据第一段A new set of images(图象),by Dr,Kettering,tries to tell differences between cat vision and human vision可知,Kettering是通过图象进行研究的.故选A.
52.答案D.细节理解题.根据第二段Cats are also better at finding a mouse or toy moving in the corner because of a greater peripheral vision(周边视觉)可知,猫可以捕捉到角落里移动的事物是因为它们的周边视觉很广.故选D.
53.答案B.细节理解题.根据第三段their eyes have six to eight times more rod cells,which are more sensitive to low light,than humans可知,猫眼睛中的杆体细胞是人的六到八倍.故选B.
54.答案C.细节理解题.根据倒数第二段Humans also have three types of cones,allowing them to see a broad range of colors,with sensitivity peaks at red,green and blue可知,人的眼睛可以看到更多的颜色.故选C.
55.答案D.推理判断题.根据Humans can see objects clearly at 100to 200feet (30to 60meters)away,but cats need to be no more than about 20feet (6m) away to see those same things sharply可知,人的眼睛能看到100-200英尺内的物体,猫的眼睛只能看到20英尺内的.故推断人的眼睛比猫的眼睛看见的范围更广.故选D.

点评 答题策略如下:
1、先题后文:
先读试题,了解考点;明确目的,快速捕捉,获取信息.
2、题干定向:
根据题干关键词到文中定位答案范围,按照题目顺序依次而下:问题与材料相同:对号入座;问题与原文相同:同义替换、归纳事实等.

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