Othersarguethatsincetheearthhasenduredalongstringoficeagesinthelasttwomilliontothreemillionyears,anywarmingis________tobetemporary.
________withthesizeofthewholeearth,thehighestmountainsdonotseemhighatall.
Thestudentfoundthenovel_______.Itprovidedhimwithsomuchinformationaboutthesubject.