大学英语四级阅读理解练习题.docx

大学英语四级阅读理解练习题

一提到英语四级阅读，想必是不少学生的软肋。下面是为大家介绍英语四级阅读理解练习题。Merchantandpassengershipsaregenerallyrequiredtohavealifepreserverforeverypersonaboardandinmanycases,acertainpercentageofsmallersizesforchildren.AccordingtoUnitedStatesrequirements,lifepreserversmustdesign,reversiblecapableofbeingquicklyadjustedtofittheuninitiatedinpidual,andmustbesodesignedastosupportthewearerinthewaterinanuprightorslightlybackwardposition.Sufficientbuoyancy(浮力)tosupportthewearershouldberetainedbythelifepreserverafter48hoursinthewater,anditshouldbereliableevenafterlongperiodofstorage.Thusitshouldbemadeofmaterialsresistanttosunlight,gasoline,andoils,anditshouldbenoteasilysetonfire.?Thepositioninwhichthelifepreserverwillsupportapersonwhojumpsorfallsintothewaterismostimportant,asisitstendencytoturnthewearerinthewaterfromaface-downpositiontoanuprightorslightlybackwardposition,withhisfaceclearofthewater,evenwhenthewearerisexhaustedorunconscious.Themethodofadjustmenttothebodyshouldbesimple,andself-evidenttouninitiatedpersonseveninthedarkundertheconfusedconditions,whichfollowadisaster.Thus,thelifebereversiblethatitisnearlyimpossibletogetitonwrong.Catches,straps,andtiesshouldbekepttoaminimum.Inaddition,thelifepreservermustbeadjustabletothewidevarietyofshapesandsizesofwearers,sincethisgreatlyaffectsthepositionoffloatingandtheself-rightingqualities.Asuitablelifealsobecomfortabletowearatalltimes,inandoutofthewater,notsoheavyastoencouragetotakeitoffonshipboardwhiletheshipisindanger,norsoburdensomethatithindersapersoninthewaterwhiletryingtoswim.1.Thepassageismainlyabout____.A)theusesoflifepreserversB)thedesignoflifepreserversC)thematerialsforlifepreserversD)thebuoyancyoflifepreservers2.Accordingtothepassage,alifebefirstofall____.A)adjustableB)comfortableC)self-evidentD)self-righting3.UnitedStatesCoastGuarddoesNOTrequirethelifepreservertobemade____.A)withasfewstringsaspossibleB)capableofbeingwornonbothsidesC)accordingtoeachwearer'ssizeD)comfortableandlighttowear4.By“theuninitiatedinpidual”(Para.1,Line.4)