题目内容：
根据以下材料，回答题Theseaisverybig.Lookatamapoftheworld.Thereislesslandthansea.Theseacoversthreequartersoftheworld.
Theseaisverydeepinsomeplaces.Thereisonespot,nearJapan,wheretheseaisnearly11kilometresdeep.Thehighestmountainintheworldisabout9kilometreshigh.Ifthatmountainwereput
intotheseaatthatplace,therewouldbe2kilometresofwateraboveit.
Ifyouhaveswuminthesea,youknowthatitissalty.Youcantastethesalt.Rivers,whichflowintothesea,carrysaltfromthelandintothesea.Somepartsoftheseaarelesssaltythanotherparts.
Thereisonesea,calledtheDeadSea,whichisverysalty.Becauseitisverysalty,swimmerscannotsink!FishcannotliveintheDeadSea.Inmostpartsofthesea,thereareplentyoffishesandplants.
Somelivenearthetopofthesea.
Otherslivedeepdown.Therearealsomillionsoftinylivingthingsthatfloatinthesea.Thesefloatingthingsareverysmall.Itishardtoseethem.Manyfishlivebyeatingthem.
Theseacanbeverycold.Divers,whodivedeepdowninthesea,knowthis.Onthetopthewatermaybewarm.Whenthedivergoesdownwards,theseabecomescolderandcolder.
Anotherthinghappens.Whenthedivergoesdeeper,thewaterabovepressesdownonhim.Itsqueezeshim.Thenthediverhastowearclothesmadeofmetal.
OnespotoftheseanearJapanis_______ A．nearlyninekilometresdeep
B．Mmostelevenkilometreshigh
C．twokilometresabovethehighestmountainintheworld
D．twokilometresdeeperthantheheightoftheworld'shighestmountain
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答案解析：