1、三轮阅读理解巅峰绝招 第四讲 破解科技文绝招2013年科技文命题规律2012-11年科技文出现省区一、科技文体的自身特点二、科技文破解绝招科技文，主旨在首尾首段 Almost every machine with moving parts has wheels,yet no one knows exactly when the first wheel was invented or what it was used for.We do know,however,that they existed over 5,500 years ago in ancient Asia.in 2002 over
2、 5,100 years old.尾段 In the mid-1700s,in 1846.Alloy wheels were invented in 1967,sixty years after the appearance of tarmacked roads（柏油路）.As wheel design took off,vehicles got faster and faster.67.What is the passage mainly about?A.The beginning of road design.B.The development of transport wheels.C.
3、The history of public transport.D.His invention of fast-moving vehicles.（2013天津）45.What message does the author most want to give us?A.Saving wildlife is saving ourselves.B.Great efforts should be made to save energy.C.Human activities should be environmentally friendly.D.New equipment should be int
4、roduced for space study.合并首尾段摘首尾段要点（2013江西）67.What is mainly discussed in Paragraph 2?A.How to listen well.B.What to listen to.C.Benefits of listening.D.Problems in listening.四、考目的，看整体，看动机，看意义Below is a selection from a popular science book.If blood is red,why are veins（静脉）blue?Which works harder,yo
5、ur heart or your brain?Why do teeth fall out,and why dont they grow back in grown-ups?Do old people shrink as they age?Why does spinning make you dizzy（眩晕的）?Where do feelings and emotions come from?If exercise wears you out,how can it be good for you?五、问原因，标题中有线索词最方便Do old people shrink as they age?
6、Yes and do.Many people do get shorter as they age.But,when they do,it isnt because theyre shrinking all over.They simply lose height as their spine（脊柱）becomes shorter and more curved due to disuse and the effects of gravity（重力）.Many(but not all)men and women do lose height as they get older.Men lose
7、 an average of 3-4 cm in height as they age,while women may lose 5 cm or more.If you live to be 200 years old,would you keep shrinking till you were,like 60 cm tall,like a little boy again?No,because old people dont really shrink!It is not that they are growing backwards 一 their legs,arms and backbo
8、nes getting shorter.When they do get shorter,its because the spine has shortened a little.Or,more often,become more bent and curved.问原因，有的原因较含蓄六、考细节，可从题干挖掘线索（2013江苏）61.Which of the following is a typical symptom of the bends?首题看首段A.A twisted body.B.A gradual decrease in blood supply.C.A sudden release of nitrogen in blood.D.A drop in blood pressure.经验谈谢谢您的观看！
