2016年12月英語六級長篇閲讀預測練習
2016年12月英語六級考試將在12月17日舉行,對於英語六級考試閲讀分數佔比還是不小的,
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.
These optical illusions occur because the brain is constantly matching its model of reality to signals from the body’s sensors and interpreting what must be happening—that 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.
The sensors that make this magic are of two kinds. Each eye contains 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.
Color vision in each eye comes from six to seven million structures called cones. Under 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.
Rods and cones send their messages pulsing an average 20 to 25 times per second along the optic nerve. We see 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.
Like apparent motion, color vision is also subject to unusual 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 garden’s blue flowers.
However, look at a white shirt during the reddish light of sunset, and you’ll still see it in its “true” color—white, 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 adjust accordingly.
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.
Yet all this 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?”
al illusions often take place when the image of reality is ___.
hed to six to seven million structures called cones.
used in the body’s sensors of both rods and cones.
rpreted in the brain as what must be the case.
aled by about 120 million rods in the eye.
visual sensor that is capable of distinguishing shades of color is called ___.
s
r vision
trum
retina send pulses to the brain ___.
short wavelengths
color pictures
a ganglion cell
g the optic nerve.
ty-four still photographs are made into a continuous moving picture just because ___.
image we see usually stays longer than it actually appears.
see an object in comparison with its surroundings.
eyes catch million pieces of information continuously.
and cones send messages 20 to 25 times a second.
author’s purpose in writing the passage lies in ___.
ing that we sometimes are deceived by our own eyes.
rming us about the different functions of the eye organs.
etting that we are too slow in the study of eyes.
eling at the great work done by the retina.
答案:CADAB
-
大城市還是小城市英語六級作文(精選7篇)
在平日的學習、工作和生活裏,大家一定都接觸過作文吧,作文根據寫作時限的不同可以分為限時作文和非限時作文。你所見過的作文是什麼樣的呢?以下是小編幫大家整理的大城市還是小城市英語六級作文,僅供參考,希望能夠幫助到大家。大城市還是小城市英語六級作文篇1‘avo...
-
2017年6月大學英語六級詞彙強化練習
不要嘲笑鐵樹。為了開一次花,它付出了比別的樹種更長久的努力,以下是小編為大家搜索整理的2017年6月大學英語六級詞彙強化練習,希望對正在關注的您有所幫助!更多精彩內容請及時關注我們應屆畢業生考試網!vocal發聲的,聲樂的;直言的,坦率的;(常pl.)(音樂的)歌唱部分w...
-
2016年12月英語六級翻譯基礎備考習題
六級翻譯的大綱要求是原單句漢譯英調整為段落漢譯英。翻譯內容涉及中國的歷史、文化、經濟、社會發展等。六級長度為180-200字。以下是yjbys網小編整理的關於英語六級翻譯基礎備考習題,供大家練習。翻譯一:網絡消費如今,隨着網絡的發展,越來越多的人喜歡網上購物。...
-
2022年12月英語六級閲讀突破練習題
閲讀理解是大學英語六級中的重頭戲,所以大家在備考時應該把精力多放在閲讀練習上。以下是小編整理的12月英語六級閲讀突破練習題,供大家備考。BeethovenAndLennonLudwigVanBeethoven1wasoneofthegreatestmusiciansinthe19thcentury.JohnLennon2wasoneofthegreate...