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B.The advantages of planting trees.in the atC.The functions of trees used in daily lifes have brD.The link between trees and human well-being.31.Why does the author mention those famous organizations?rom planes withA.To show their great cooperation.B.To stress planting trees is valued.ogist wC.To announce their achievements.e groupD.To prove their importance to the world.Ip provDnd giveYou may have seen or used disappearing ink.One minute you're writing,and the next如poof!Your words are gone.It's almost like magic.Now,scientists have performed perhapsdoan even more impressive trick.Using transparent ink,they have printed images in a full rain-rillion斟bow of colors.The key to this innovation:They print the clear liquid in precise small pat-anet.terns.Those tiny patterns create what's known as structural color.ects,长Unlike the dyes (used to color most products,structural colors won't fade.Andp of tlthey don't use chemicals that can pollute the environment.Structural colors arise from theups.way different colors-wavelengths of light-reflect off microscopic structures."In nature,区there are many beautiful structural colors,"says Yanlin Song.He's a materials chemist at theChinese Academy of Sciences.Some bird feathers and butterfly wings wear bright structural数colors,he notes.This phenomenon also colors chameleons'()skin and some flowerpetals.痢Song's team printed structural colors on transparent,flexible sheets of silicone )To do this,they used an ordinary ink-jet printer and a clear,nontoxic polymer ink.The print-er covered the silicone sheets with millions of microscopic ink domes.Adjusting the size of朝each dome determined what wavelengths of light it would reflect.That,in turn,controlledippothe dome's color.The denser the ink domes were packed,the brighter an image became.3.Printing domes of several different colors across a single area created mixed shades.For in-stance,combining red,yellow and green domes made brown."The printing speed needs to be improved,"Song says.An image 2 by 2 centimetersacross (0.8 by 0.8 inches)took about five minutes to make.The next step,he says,is tobuild faster printers that can quickly create large images whose colors come from structuralcolors.32.What do disappearing ink and transparent ink have in common?thoA.They are tricks for entertainment.全国100所名校最新高考模拟际范卷第7页(共12页)【22·ZX·MN·英语(四)·Y】