Unit2Sailingtheoceans 高中英语 选修9 人教版X Thevastseasurroundingthecontinentshasalwaysinterestedthebravehumanbeing Theseahasalwaysinterestedman Fromtheseamancangetfood minerals andtreasure Forthousandsofyears hecouldsailonit Buthecouldnotgofarbeneathitssurface Manhasbeendreamingofexploringdeepintothesea However thisisonlyadreamasheisnotafish Hemustbreatheair sohecan tstayunderthewater ssurfaceforanylengthoftime Toexploredeepwater manfacesevenmoredangersandproblems Adiverwhowantstostayunderwaterformorethanafewminutesmustbreatheairoraspecialmixtureofgases Hecanwearadivingsuitandhaveairpumpedtohimfromabove Hecancarryatankofaironhisbackandbreathethroughahose 软管 andamouthpiece Waterweighs800timesasmuchasair Tonsofwaterpushesagainstadiverdeepinthesea Hisbodyisundergreatpressure Whenadiverisundergreatpressure hisbloodtakesinsomeofthegaseshebreathes Asherisestosurface thewaterpressurebecomesless Ifthediverrisestooquickly thegasesinhisbloodformbubbles 气泡 Thediveristhensufferingfromthebends 潜水员病 Thebendscancauseadivertodoubleupinpain Theycanevenkillhim 1 Onthewhole thistextisabout A specialmixturesofgasesindeepseaB theproblemsadiverfacesindeepseaC airpressureunderthesurfaceofseawaterD akindofillnessthatmansuffersinthesea答案B 2 Thetextdoesnotsayso butitmakesyouthinkthat A deep seadiversshouldbeingoodhealth B diversexplorethedeepseaonlyfortreasure C thereisaspecialmixtureofgasesunderthesea D divingunderthewatertooquicklycausesakindofillness 答案A 3 Fromthetextwecanlearnthat A mancannotstayunderwaterformorethanafewminutes B theseabegantointerestmaninthelastfewyears C alldiverswillgetthebendssoonerorlater D thebendsmaykilladiver 答案D