新教材2020-2021学年高中英语外研版选择性必修第三册课时作业:UNIT 6 SECTION Ⅲ DEVELOPING IDEAS .doc
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1、课时作业(十八)Unit 6Section Developing ideas & Presenting ideas.阅读理解AIt is a question that has long puzzled scientistsexactly why are tigers orange? One might think it makes them more obviousparticularly against a leafy green forest background. William Blake summed it up in his famous poem known by genera
2、tions of schoolchildren:“Tyger, tyger, burning bright. In the forest of the night.” But now the answer is at hand.While obvious to us, computer simulations (模拟) of what the big cats look to the main animals they hunt for, deer, show a different picture. Humans with normal colour vision, can see red,
3、 blue and green colours. But deer can only pick up blue and green light; they are effectively colourblind to the colour red, like some humans. It means the tigers orange colouration looks green to them, allowing them to mix perfectly into the background, new research claims.Dr John Fennell at the Un
4、iversity of Bristol and colleagues said that they used computers to estimate how noticeable a given animal was. They did this by using images of the environment in which the animal lives, and then creating images to see whether the camouflage helps the animal to mix in.Dr Fennell writes that by simu
5、lating what the world looks like to animals who are “twocolour vision”someone who cannot discover the difference between red and green“we also identify the most suitable colours for hiding and visibility”Dr Fennell writes in the Royal Society Journal Inter Face:“Considering the coat of a tiger, it h
6、as fur that appears orange to a threecolour vision observer rather than some shade of green, though the latter should be more appropriate colour for an attack hunter in forests. However, when viewed as a twocolour vision observer, the tigers colour is very effective.”The question then arises as to w
7、hy tigers dont grow green coats. Dr Fennell and colleagues write that mammals (哺乳动物) are not able to produce green fur. To do so would “require a significant change to mammalian biochemistry”. There is only one mammal known to have green fur but this is achieved through what might be considered as,
8、well, cheating, not exactly real.1Why does the author mention the poem in Paragaph 1?ATo arouse readers interest in poems.BTo show the authors respect to the poet.CTo answer the question of the colour of the tiger.DTo stress the noticeable colour of the tiger to us.2What colour is nonexistent in the
9、 eyes of deer?ABlack. BRed.CBlue. DGreen.3What does the underlined word “camouflage” mean in Paragraph 3?AThe cover of something.BThe images of something.CThe way of hiding something.DThe way of hunting for something.4What can be inferred from the last paragraph?AThe colour of tigers sometimes cheat
10、s people.BGetting green may prevent tigers from being extinct.CThere are no mammals with real green fur in the world.DThe tigers fur will probably evolve into green in the future.BThe term “to extend an olive (橄榄) branch” means to make an offer of peace or reconciliation(和解). This term has Biblical(
11、圣经的)origins, coming from the section of the Old Testament that deals with the flood; the sign that the flood is over is an olive branch brought back to the ark (方舟) by a dove. Olive branches were also symbols of peace in Ancient Greece and Rome, and they continue to be used in various works of art t
12、hat are meant to suggest peace.Some people have suggested that the olive branch is a very deliberate and wellconsidered choice as a metaphor(隐喻)for peace, because olive trees famously take years to mature. War is typically very hard on the trees because people cannot take the time to nurture them an
13、d plant new ones. Therefore, the offer of an olive branch would suggest that someone is tired of war, whether it is an actual war or a falling out between friends.In Ancient Greek and Roman times, people would offer actual olive branches. In Rome, for example, defeated armies traditionally carried o
14、live branches to indicate that they were giving in, and the Greeks used them into weddings and other ceremonies. In the modern era, the branch is usually metaphorical, rather than actual, not least because the plants can be a bit difficult to obtain.Many people agree that peace negotiations at all l
15、evels of society are a good idea. Between nations, obviously, it is important to extend an olive branch to ensure mutual safety and to help the world run more smoothly. This act can also be important on a personal level, as resolving conflict and learning to get along with others are viewed as impor
16、tant life skills in many cultures.At some point in their lives, many people will be advised to extend an olive branch to settle a dispute or resolve an issue. Some people believe that it takes an immense amount of courage to take this action, as it often comes with an admission of wrongdoing and reg
17、ret.5According to the Bible, _.Aan olive branch suggests flood is comingBthe ark is made of olive tree woodCan olive branch means flood is overDa dove loves to settle on the olive branch6The olive branch is considered a good choice as a metaphor for peace for the following reasons EXCEPT _.Aolive tr
18、ees famously take years to matureBolive branches make people tired of warCwar is typically very hard on the treesDpeople cannot take the time to nurture them while at war7Why are actual olive branches seldom used in modern times?AOlive trees are being protected now.BOlive trees are planted only in c
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