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deDunes rarely cc therwn,but instedosmethingvingdune fieldshTheovewwith wind and water lowpa-and smaller dunes are known tofaster than argene But how the dunes interactthallyone another has been the topic of debate.CS,There are different theories,"explains Karol Bacik,the first author of the paper."eis that dunes of different sizes will collide ()and keep colliding,until they form onelarge dune,although this hasn't yet been observed in nature."Another theory is that dunescollide and exchange mass until they are the same size and move at the same speed.Led by Nathalie Vriend of Cambridge University,the researchers built a water-filled瑞round flume (where two small sand dunes could move around.The little dunes,thoughthey were the same size and shape,didn't move together at the same speed,which surprised些the researchers.Instead,the dunes moved away from each other as if they didn't like eachother.Finally,once the dunes had reached the opposite sides of the flume,they formed a$balance.Large piles of sand could threaten coastlines and buildings,the researchers say,and beingable to predict dunes'movement could help reduce some of the damage.But in a more immedi-ate sense,the experiment showed how dunes express their need for space,without making a sound.32.What can we know about sand dunes?熘A.They usually run on their own.odw snovs 1o1 a novo otsldsointen2R.Thoy tend to form a beautiful scene.够C.They can affect the local weather badly.46927D.They can make sounds to communicate.t四n0gynl霄33.What is Karol Bacik talking about in the third paragraph?A.Two theories about dunes'size.B.Two explanations on how dunes form.C.The possible rules of dunes'movements.D.Two research-based theories about dunes.全国100所名校最新高考模拟示范卷第6页（共12页）【22·（新高考）ZX·MN·英语（三）·G DONG】
