1、Thepassageismainlyabout_
A、theusesoflifepreservers
B、thedesignoflifepreservers
C、thematerialsforlifepreservers
D、thebuoyancyoflifepreservers
2、Accordingtothepassage，alifebefirstofall
A、adjustable
B、comfortable
C、self-evident
D、selfrighting
3、UnitedStatesCoastGuarddoesNOTrequirethelifepreservertobemade_
A、withasfewstringsaspossible
B、capableofbeingwornonbothsides
C、accordingtoeachwearerssize
D、confortableandlighttowear
4、By“theuninitiatedindividual”(Para.1，Line.4)theauthorreferstotheperson
A、whohasnotbeeninstructedhowtousealifepreserver
B、whohasalittleexperienceinusingalifepreserver
C、whousesalifepreserverwithoutpermission
D、whobecomesnervousbeforeadisaster
5、Whatwouldhappenifapersonweresupportedbythelifepreserverinawrongposition?
A、Thewaveswouldmovehimbackwards
B、Thewaterwouldchokehim
C、Hewouldimmediatelysinktothebottom
D、Hewouldbeexhaustedorunconscious