Thejourneytwonaval(海军)officersmadesometimeagototileverydeepestpointontheearthmakesusrealizehowmuchoftheworldstillremainstobeexplored(探测).ThetwomenwentdownseveralmilestothebottomofthePacific

　　Thejourneytwonaval(海军)officersmadesometimeagototileverydeepestpointontheearthmakesusrealizehowmuchoftheworldstillremainstobeexplored(探测).ThetwomenwentdownseveralmilestothebottomofthePacificOceanhidinginasmallsteelballcalleda“bathy-scaphe”tofindoutifthereareanyoceancurrents(急流)orsignsoflife.

　　Itwasnecessarytosetontearlysothatthebathyscaphewouldcometothesurfaccindaylightandsobeeasilyfoundbythemothershipwhichwouldbewaitingforit.Thediversbeganpreparationsatdawnandsoonafterwardswhenallwasreadythesteelballdisappearedunderthesurfaceofthewater.

　　Intimethetemperaturedroppedtofreezing-pointandthementrembledinsidetheball.Theykeptintouchwiththemothershipbytelephonedescribinghowtheyfelt.Thenatadepthof3000feetthetelephonestoppedworkingandtheywerequitecutofffromtheoutsideworld.At30000feetthemenweresurprisedbyasuddenloudnoise-------eventhesmallestholeintheballwouldhavemeantinstantdeath.Luckilythoughitwasonlyoneoftheouterwindowsthathadbroken.Soonafterwardsthebathyscaphetouchedthesoftoceanfloorraisingabigcloudof“dust”madeupofdifferentkindsofsmalldeadseaanimals.Herepowerfullightslitupthedarkwaterandthemenweresurprisedtoseefishswimmingjustabovethemquiteuntroubledbythcverylargewate-pressure.Buttheydidnotdaretoleavethelightsonforlongastheheatfromthemmadethewaterboil.Quiteunexpectedlythetelephonebeganworkingagainandtheweakbutclearvoicesoftheofficerswereheardonthcmothership.Afterastayofthirtyminutesthemenbegantheirjourneyuparrivingthreehourslatercoldandwetthroughbutnonetheworsefortheirexperience.

　　1.Theofficersstartedtheirjourneyatdawn___.

　　A.becausetheywantedtoreturntothemothershipintwentyfourhours

　　B.becausetheseathenwascalm

　　C.whenthesunwasnottoostrong

　　D.sothattheycouldreturnbeforedark

　　2.Whatdidtheofficersfindoutatthebottomofthesea?

　　A.Theyonlyfounddifferentdeadseaanimals.

　　B.Theydidfindsignsoflife.

　　C.Therewasnosignsofanylife.

　　D.Therewasonlydust.

　　3.Thejourneytothebottomofthe