2013年大学英语六级考试阅读训练题（8）3800字

《2013年大学英语六级考试阅读训练题（8）3800字》由会员分享，可在线阅读，更多相关《2013年大学英语六级考试阅读训练题（8）3800字（3页珍藏版）》请在装配图网上搜索。

1、2013年大学英语六级考试阅读训练题（8）3800字 2013年大学英语六级考试阅读训练题汇总 毕业 You stare at waterfall for a minute or two, and then shift your gaze to its surroundings. What you now see appears to drift upward. 开题报告 /html/lunwenzhidao/kaitibaogao/ These optical illusions occur because the brain is constantly matching its model

2、 of reality to signals from the bodys sensors and interpreting what must be happeningthat your brain must have moved, not the other; that downward motions is now normal, so a change from it must now be perceived as upward motion. 论文代写 The sensors that make this magic are of two kinds. Each eye conta

3、ins about 120 million rods, which provide somewhat blurry black and white vision. These are the windows of night vision; once adapted to the dark, they can detect a candle burning ten miles away. 思想汇报 /sixianghuibao/Color vision in each eye comes from six to seven million structures called cones. Un

4、der ideal conditions, every cone can “see” the entire rainbow spectrum of visible colors, but one type of cone is most sensitive to red, another to green, a third to blue. 思想汇报 /sixianghuibao/Rods and cones send their messages pulsing an average 20 to 25 times per second along the optic nerve. We se

5、e an image for a fraction of a second longer than it actually appears. In movies, reels of still photographs are projected onto screens at 24 frames per second, tricking our eyes into seeing a continuous moving picture. 总结大全 /html/zongjie/Like apparent motion, color vision is also subject to unusual

6、 effects. When day gives way to night, twilight brings what the poet T.S. Eliot called “the violet hour.” A light levels fall, the rods become progressively less responsive. Rods are most sensitive to the shorter wavelengths of blue and green, and they impart a strange vividness to the gardens blue

7、flowers. 毕业论文However, look at a white shirt during the reddish light of sunset, and youll still see it in its “true” colorwhite, not red. Our eyes are constantly comparing an object against its surroundings. They therefore observe the effect of a shift in the color of illuminating on both, and adjus

8、t accordingly. 思想汇报 /sixianghuibao/The eyes can distinguish several million graduations of light and shade of color. Each waking second they flash tens of millions of pieces of information to the brain, which weaves them incessantly into a picture of the world around us. 总结大全 /html/zongjie/Yet all t

9、his is done at the back of each eye by a fabric of sensors, called the retina, about as wide and as thick as a postage stamp. As the Renaissance inventor and artist Leonardo da Vinci wrote in wonder, “Who would believe that so small a space could contain the images of all the universe?” 毕业论文 1.Visua

10、l illusions often take place when the image of reality is _. 思想汇报 /sixianghuibao/A.matched to six to seven million structures called cones. 总结大全 /html/zongjie/B.confused in the bodys sensors of both rods and cones.C.interpreted in the brain as what must be the case. 开题报告 /html/lunwenzhidao/kaitibaog

11、ao/ D.signaled by about 120 million rods in the eye. 简历大全 /html/jianli/2.The visual sensor that is capable of distinguishing shades of color is called _.A.conesB.color vision 作文 /zuowen/C.rods 作文 /zuowen/D.spectrum3.The retina send pulses to the brain _. 毕业论文A.in short wavelengthsB.as color pictures

12、 毕业论文C.by a ganglion cell 开题报告 /html/lunwenzhidao/kaitibaogao/D.along the optic nerve. 毕业4.Twenty-four still photographs are made into a continuous moving picture just because _. 简历大全 /html/jianli/A.the image we see usually stays longer than it actually appears. 思想汇报 /sixianghuibao/B.we see an objec

13、t in comparison with its surroundings. 毕业 C.the eyes catch million pieces of information continuously. 毕业D.rods and cones send messages 20 to 25 times a second. 毕业5.The authors purpose in writing the passage lies in _. 总结大全 /html/zongjie/A.showing that we sometimes are deceived by our own eyes.B.informing us about the different functions of the eye organs. 毕业论文C.regretting that we are too slow in the study of eyes. 思想汇报 /sixianghuibao/D.marveling at the great work done by the retina. 开题报告 /html/lunwenzhidao/kaitibaogao/答案：CADAB 开题报告 /html/lunwenzhidao/kaitibaogao/