高一英语暑假阅读天天练 第十八天.doc

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1、我的暑假第十八天：（自然类）(1)Putanicecubefromyourfridgeintoaglassofwater.Youhaveapieceofstring(线)10centimeterslong.Theproblemistotakeoutthatpieceoficewiththehelpofthestring.Butyoumustnottouchtheicewithyourfingers.Youmayaskyourfriendstotrytodothatwhenyouarehavingdinnertoge

2、ther.Thereisasaltcellaronthetable.Youmustusesaltwhenyoucarryoutthisexperiment.Firstyouputthestringacrossthepieceofice.Thenputsomesaltontheice.Saltmakesicemelt(融化).Theiceroundthestringwillbegintomelt.Butwhenitmelts,itwillloseheat.Thecoldicecubewillmakethesaltwa

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

4、in.1.Wemustuse_______whenwecarryoutthisexperiment.A.fridgeB.somefoodC.atableD.somesalt2.Howlongwillittaketocarryoutthisexperiment?A.Morethanthreeminutes.B.Fiveminutesorso.C.Onlyoneminuteortwo.D.Abouttenminutes.3.Whatisthetaskofthisexperiment?A.Puttheicecubeint

5、otheglassofwaterwiththehelpofthestring.B.Takeouttheicecubeintheglassofwaterwiththehelpofthestring.C.Takeouttheicecubeintheglassofwaterwithyourfingers.D.Putsomesaltontheicecubeandthenputthestringacrossit.4.Howmanythingsatleastareusedinthisexperiment?A.Three.B.F

6、our.C.Six.D.Seven.5.Wecanlearnsomethingabout_______fromthepassage.A.PhysicsB.biologyC.chemistryD.maths3用心爱心专心(2)Bambooisoneofthenature’smostsurprisingplants.Manypeoplecallthisplantatree,butitisakindofgrass.Likeotherkindsofgrass,abambooplantmaybecutverylowtothe

7、ground,butitwillgrowbackveryquickly.AJapanesescientistrecordedonebambooplantthatgrewalmost1.5metersin24hours!BamboogrowsalmosteverywhereintheworldexceptEurope.Therearemorethan1,000kindsofbamboothatgrowaroundtheworldonbothmountainsandplains(平原).Notallbamboolook

8、sthesame.Somebambooplantsareverythin.Theymayonlygrowtobeafewcentimeterswidewhileothersmaygrowtomorethan30centimetersacross.Thisplantalsocomesindifferentcolors,fromyellowtoblacktogr