5.A new set of images(圖象),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(周邊視覺)
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(目鏡)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 (移動偵測)in bright light than the cat,since bright-light vision is a cone function(視錐細胞功能)",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 本文為科教文,文章主要介紹了貓的眼睛的特殊之處,并與人眼作對比.

解答 51---55 ADBCD
51.答案A.細節(jié)理解題.根據(jù)第一段A new set of images(圖象),by Dr,Kettering,tries to tell differences between cat vision and human vision可知,Kettering是通過圖象進行研究的.故選A.
52.答案D.細節(jié)理解題.根據(jù)第二段Cats are also better at finding a mouse or toy moving in the corner because of a greater peripheral vision(周邊視覺)可知,貓可以捕捉到角落里移動的事物是因為它們的周邊視覺很廣.故選D.
53.答案B.細節(jié)理解題.根據(jù)第三段their eyes have six to eight times more rod cells,which are more sensitive to low light,than humans可知,貓眼睛中的桿體細胞是人的六到八倍.故選B.
54.答案C.細節(jié)理解題.根據(jù)倒數(shù)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顏色.故選C.
55.答案D.推理判斷題.根據(jù)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英尺內的物體,貓的眼睛只能看到20英尺內的.故推斷人的眼睛比貓的眼睛看見的范圍更廣.故選D.

點評 答題策略如下:
1、先題后文:
先讀試題,了解考點;明確目的,快速捕捉,獲取信息.
2、題干定向:
根據(jù)題干關鍵詞到文中定位答案范圍,按照題目順序依次而下:問題與材料相同:對號入座;問題與原文相同:同義替換、歸納事實等.

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