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28.Why are scientists fond of doing research onbirds32.WhA.They are sensitive to hot weather.AB.They have small body sizes.C.C.They live in an undisturbed rainforest.33.W1D.They are ecological balance indicators.A29.What can we learn from the new study?A.A third of species have been extinct for a decade.cB.Two-thirds of species showed a considerable decrease in weight.34.H6C.About 26 species responded to climate change with longer wings.w35.WD.36 species lost 2%of their body weight every year.30.What does the underlined word"dissipate"in the last parag?AA.Put away.B.Give off.C.Take off.D.Give away.B.31.What would probably the researchers further study?CDA.Why the Amazonian birds have lost substantial weight.第B.What effects the wing length changes have on birds.阅或C.Why it is easier for smaller animals to keep cool.两项D.Whether bird species in North America will be extinct in 2100.DdiffictSomeday,you may no longer need to brush your teeth by hand.Instead,adifficgroup of billions of nanoparticles(纳米粒子)could automatically do all that work36.for you.It would be especially life-changing for people who find it difficult orfamilyimpossible to hold and move a toothbrush.Steager,an engineer at the University of Pennsylvania (Penn)in Philadelphialaw,and Hyun Koo,an inventor and dental researcher there,found a way to form theYounanoparticles into long,skinny bristles(刷毛)，a lot like the ones on atoothbrush.But these bristles shape-shift to fit whatever surface they encounter.for thThe tooth-cleaning robot works thanks to two magnets ()One goes eachside of the teeth.The nanoparticles sit in a liquid between the magnets.When theencoand rmagnets are turned off,the nanoparticles move randomly in the liquid.As soon asone magnet gets turned on,the nanoparticles gather together near its center.When the researchers turn on the other magnet and turn off the first one,theor sunanoparticles extend outward in long,skinny bristles.When there's a tooth in theThisway,these bristles can't stretch ou as far as they want.So they push against thetoothsurace.If there'sa gap between teeth,they push into the gap.Moving thewithmakes the briseveaainst and betwee teethAll thmotioa cerhetshe prics havestoe tokll iruseMakTheedevicefThe reercerseedthelpinto a product that people will want to use."There's a lot of engineering to getmhere tthere,but every good idea needs to have a start.ays Steager.62024届·普通高中名校联考信息卷（月考三）·英语