2019-2020年高一英语暑假阅读天天练 第十八天

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1、2019-2020年高一英语暑假阅读天天练第十八天（自然类）(1)Putanicecubefromyourfridgeintoaglassofwater.Youhaveapieceofstring(线)10centimeterslong.Theproblemistotakeoutthatpieceoficewiththehelpofthestring.Butyoumustnottouchtheicewithyourfingers.Youmayaskyourfriendstotrytodothatwhenyoua

2、rehavingdinnertogether.Thereisasaltcellaronthetable.Youmustusesaltwhenyoucarryoutthisexperiment.Firstyouputthestringacrossthepieceofice.Thenputsomesaltontheice.Saltmakesicemelt(融化).Theiceroundthestringwillbegintomelt.Butwhenitmelts,itwillloseheat.Thecoldicec

3、ubewillmakethesaltwaterfreezeagain.Afteraminuteortwoyoumayraisethepieceofstringandwithityouwillraiseyourpieceofice!Thisexperimentcanbeveryusefultoyou.If,forexample,thereisicenearthedoorofyourhouse,youmustuseverymuchsalttomeltalltheice.Ifyoudon’tputenoughsalt

4、,thewaterwillfreezeagain.1.Wemustuse_______whenwecarryoutthisexperiment.A.fridgeB.somefoodC.atableD.somesalt2.Howlongwillittaketocarryoutthisexperiment?A.Morethanthreeminutes.B.Fiveminutesorso.C.Onlyoneminuteortwo.D.Abouttenminutes.3.Whatisthetaskofthisexper

5、iment?A.Puttheicecubeintotheglassofwaterwiththehelpofthestring.B.Takeouttheicecubeintheglassofwaterwiththehelpofthestring.C.Takeouttheicecubeintheglassofwaterwithyourfingers.D.Putsomesaltontheicecubeandthenputthestringacrossit.4.Howmanythingsatleastareusedin

6、thisexperiment?A.Three.B.Four.C.Six.D.Seven.5.Wecanlearnsomethingabout_______fromthepassage.A.PhysicsB.biologyC.chemistryD.maths(2)Bambooisoneofthenature’smostsurprisingplants.Manypeoplecallthisplantatree,butitisakindofgrass.Likeotherkindsofgrass,abambooplan

7、tmaybecutverylowtotheground,butitwillgrowbackveryquickly.AJapanesescientistrecordedonebambooplantthatgrewalmost1.5metersin24hours!BamboogrowsalmosteverywhereintheworldexceptEurope.Therearemorethan1,000kindsofbamboothatgrowaroundtheworldonbothmountainsandplai

8、ns(平原).Notallbamboolooksthesame.Somebambooplantsareverythin.Theymayonlygrowtobeafewcentimeterswidewhileothersmaygrowtomorethan30centimetersacross.Thisplantalsoesindifferentcolors,fromyellowtobla