delicate step gives mosquitoes strength to walk on water阅读理解答案.

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1、Delicatestepgivesmosquitoesstrengthtowalkonwater阅读理解答案.　　Delicatestepgivesmosquitoesstrengthtowalkonwater.　　It’snotamagicalpower.Mosquitoescanwalkonwaterbecauseoftheangleatwhichtheirlegstouchitssurface.　　Amosquito’slegisstrongenoughtobearupto23timesitstotalbodyweight,

2、whichisonereasonwhyitcanwalkonwatersoeffortlessly.Thisisfargreaterthanthelegstrengthofotherwater-walkinginsectslikewaterstriders(水黾),whoselegshavebeenmorecarefullystudied.　　Jian-LinLiuoftheChinaUniversityofPetroleuminQingdaoandhiscolleaguesthoughtamosquito’sadvantagem

3、ightalsocomefromtheprotectivewaxandmicroscopicscales(鳞片)coatingitslegs.Theyremovedtheselayers(层)andmeasuredthechangeintheleg’sload-bearingcapacity(承重能力),butfoundthatthelayerswereresponsibleforlessthanpercentoftheoverallsupportingforce.　　Themainplayerturnedouttobethean

4、glebetweenthelegandthewatersurface.Thesupportingforcewasstrongestwhenthelegwa　　　　snearlyparalleltothesurface.Anyanglegreaterthan62degreeswouldmakethemosquitofallthroughthesurface.　　Theresearchersbelievethatmosquitoescanadjustthisangleduringlandingandtake-offtoensureth

5、eyremainonthewater’ssurface.Thisabilityisveryimportantbecausemanyspecieslandonfreshorstillwatertolaytheireggsinit.　　Theworkcouldinspireinsect-likerobotsandwaterproofmaterials,theteamsays.　　28.Thatamosquitocanwalkonwaterwithouteffortmainlydependson___________.　　A.itsma

6、gicalpowerB.itslight-weightbody　　C.themicroscopicscalescoatingitslegs　　　　D.theanglebetweenitslegsandwater　　29.Amosquitogetsthestrongestsupportingforcewhenitslegsandthewatersurfacemakeanangleof________.　　A.0B.45C.62D.90　　30.Whatcanwelearnaboutamosquito’slegs?　　A.Amosqu

7、ito’slegsarestrongenoughtocarryotherinsectsonwater.　　B.Thestrengthofamosquito’slegsisgreaterthanthatofwaterstriders’legs.　　C.Thelayersofamosquito’slegshelpalotinsupportingitsweightonwater.　　D.Whenamosquitoputsitslegssmallerthan62°tothe　　　　water,itwillfallintoit.　　31.T

8、heinspirationfromamosquito’slegscanbeusedtodevelop________.　　A.chemicalstokillmosquitosB.robotstoworkunderthesea　　C.instrume