专四阅读理解练习8

专四阅读解练习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)通过阅读文可以排除选项A、、D因为文中没有提及，故选项B正答案。21.C)此题为段落旨题。通过阅读第四段可知作者都是讲述海参的进食