專四閱讀理解練習8

專四閱讀解練習Certainlycreatureintheseaisodderthanthecommoncucumber.Alllivingcreature,especiallyhumanbeings,havetheirpeculiarities,buteverythingthelittlecucumberseemsunusual.Whatelsecanbesaidaboutabizarreanimalthat,amongothereccentricities,mud,feedsalmostcontinuouslyandnightcanlivewithouteatingforlongperiods,andcanbepoisonousbutisconsideredsupremelyediblebygourmets?Forsomefiftymillionyears,despiteallitseccentricities,thecucumberhassubsistedonitsdietmud.Itisadaptableenoughliveattachedrocksbytubefeet,underrocksshallowwater,onthesurfaceofflats.CommoncoolwateronAtlanticandPacificshores,hastheabilitysuckupmudorsandanddigestwhatevernutrientsarepresent.Seacucumbersacolors,rangingfromblacktobrowntosandandnearlywhite.formevenhasvividpurpletentacles.Usuallycreaturesarecucumbershaped—hencetheirname—andbecausearetypicallyrockinhabitants,thisshape,combinedwithflexibility,enablesthemtosqueezeintocreviceswheretheyarefrompredatorsandoceancurrents.Althoughtheyhavevoraciousappetites,eatingandnight,seacucumbershavethecapacitybecomequiescentandliveatalowmetabolicrate—feedingsparinglyornotatallforlongperiods,thatthemarineorganismsthatprovidetheirfoodhaveachancetomultiply.Ifit

werenotforthisfaculty,theywoulddevourthefoodavailableinashorttimeandwouldprobablystarvethemselvesoutofexistence.Butthemostspectacularthingtheseacucumberisthewaydefendsitself.Itsenemiesarefishandcrabs,whenattacked,itsquirtsallitsinternalorganswater.Italsooffattachedstructuressuchtentacles.Theseacucumberwilleviscerateandregenerateitselfitattackedoreventouched;willdothesameifthesurroundingwatertemperatureistoohigh20.Accordingthepassage,istheshapeB.helpsthemtoprotectfromC.makesiteasierforthemtomovethroughthe21.ThefourthparagraphthepassageprimarilyD.threatssea22.WhatcanbeinferredaboutthedefenceA.Theyareverysensitivetosurrounding

D.Theyaresimilarthoseofmostcreatures.23.WhichthefollowingwouldNOTcauseaseacucumberreleaseitsinternalA.touch.C.Unusuallywater.D.Pollution.20.B)通過閱讀文可以排除選項A、、D因為文中沒有提及，故選項B正答案。21.C)此題為段落旨題。通過閱讀第四段可知作者都是講述海參的進食