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1、Exampleone:Certainlynocreatureintheseaisodderthanthecommonseacucumber.Alllivingcreature,especiallyhumanbeings,havetheirpeculiarities,buteverythingaboutthelittleseacucumberseemsunusual.Whatelsecanbesaidaboutabizarreanimalthat,Lineamongothereccentricities,eatsmud,feedsalmostcontinuouslydayandnig
2、htbutcan(5)livewithouteatingforlongperiods,andcanbepoisonousbutisconsideredsupremelyediblebygourmets?Forsomefiftymillionyears,despiteallitseccentricities,theseacucumberhassubsistedonitsdietofmud.Itisadaptableenoughtoliveattachedtorocksbyitstubefeet,underrocksinshallowwater,oronthesurfaceofmudf
3、lats.Commonincool(10)wateronbothAtlanticandPacificshores,ithastheabilitytosuckupmudorsandanddigestwhatevernutrientsarepresent.Seacucumberscomeinavarietyofcolors,rangingfromblacktoreddish-browntosand-colorandnearlywhite.Oneformevenhasvividpurpletentacles.Usuallythecreaturesarecucumber-shaped-he
4、ncetheirname-andbecausetheyaretypically(15)rockinhabitants,thisshape,combinedwithflexibility,enablesthemtosqueezeintocreviceswheretheyaresafefrompredatorsandoceancurrents.Althoughtheyhavevoraciousappetites,eatingdayandnight,seacucumbershavethecapacitytobecomequiescentandliveatalowmetabolicrate
5、-feedingsparinglyornotatallforlongperiods,sothatthemarineorganismsthatprovidetheirfoodhave(20)achancetomultiply.Ifitwerenotforthisfaculty,theywoulddevourallthefoodavailableinashorttimeandwouldprobablystarvethemselvesoutofexistence.Butthemostspectacularthingabouttheseacucumberisthewayitdefendsi
6、tself.Itsmajorenemiesarefishandcrabs,whenattacked,itsquirtsallitsinternalorgansintothewater.Italsocastsoffattachedstructuressuchastentacles.Theseacucumber(25)willeviscerateandregenerateitselfifitisattackedoreventouched;itwilldothesameifthesurroundingwatertemperatureistoohighorifthewaterbecomes
7、toopolluted.8.Whatdoesthepassagemainlydiscuss?(A)Thereasonfortheseacucumber'sname(B)Whatmakestheseacucumberunusual(C)Howtoidentifytheseacucumber(D)Placeswheretheseacucumbercanbefound9.Inline3,theword"bizarre"isclosestinmeaningto(A)odd(B
