资源描述：
《四级模拟阅读及答案.docx》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。
1、1.Merchantandpassengershipsaregenerallyrequiredtohavealifepreserverforeverypersonaboardandinmanycases,acertainpercentageofsmallersizesforchildren.AccordingtoUnitedStatesrequirements,lifepreserversmustdesign,reversiblecapableofbeingquicklyadjustedtofittheuninitiatedi
2、ndividual,andmustbesodesignedastosupportthewearerinthewaterinanuprightorslightlybackwardposition.Sufficientbuoyancy(浮力)tosupportthewearershouldberetainedbythelifepreserverafter48hoursinthewater,anditshouldbereliableevenafterlongperiodofstorage.Thusitshouldbemadeofma
3、terialsresistanttosunlight,gasoline,andoils,anditshouldbenoteasilysetonfire?Thepositioninwhichthelifepreserverwillsupportapersonwhojumpsorfallsintothewaterismostimportant,asisitstendencytoturnthewearerinthewaterfromaface-downpositiontoanuprightorslightlybackwardposi
4、tion,withhisfaceclearofthewater,evenwhenthewearerisexhaustedorunconscious.Themethodofadjustmenttothebodyshouldbesimple,andself-evidenttouninitiatedpersonseveninthedarkundertheconfusedconditions,whichfollowadisaster.Thus,thelifebereversiblethatitisnearlyimpossibletog
5、etitonwrong.Catches,straps,andtiesshouldbekepttoaminimum.Inaddition,thelifepreservermustbeadjustabletothewidevarietyofshapesandsizesofwearers,sincethisgreatlyaffectsthepositionoffloatingandtheself-rightingqualities.Asuitablelifealsobecomfortabletowearatalltimes,inan
6、doutofthewater,notsoheavyastoencouragetotakeitoffonshipboardwhiletheshipisindanger,norsoburdensomethatithindersapersoninthewaterwhiletryingtoswim.1.Thepassageismainlyabout____.A)theusesoflifepreserversB)thedesignoflifepreserversC)thematerialsforlifepreserversD)thebu
7、oyancyoflifepreservers2.Accordingtothepassage,alifebefirstofall____.A)adjustableB)comfortableC)self-evidentD)self-righting3.UnitedStatesCoastGuarddoesNOTrequirethelifepreservertobemade____.A)withasfewstringsaspossibleB)capableofbeingwornonbothsidesC)accordingtoeachw
8、earer'ssizeD)comfortableandlighttowear4.By“theuninitiatedindividual”(Para.1,Line.4)theauthorreferstotheperson____.A)whohasnotbeeninstructe
