根据下面每段话的陈述内容，从方框中选出各段恰当的主题，并将其字母序号填入题前横线上。
____Theworlduse1millionplasticbagseveryminute.Theycannowbefoundinallpartsoftheworld.Eachplasticbagstakesmorethan1,000yearstodisintegrate(粉碎)andnevercompletelydisappears.
____WhenIwasyoung,Ithoughtspacewaswonderful.IspentalldayimaginingthatIhadmyownspaceship.Iwouldinvitemycousinsandmyfriendstojointhetripandspendthewholedayexploringotherplanets.Thatwasmyearliestdream.
____InBrazil,peoplewearwhiteclothesonNewYear'sEve(31December)becauseitbringsgoodluck.Atmidnightpeoplegototheseaandjumpoverthewavesseventimes.ThentheythrowflowersintotheseaandmakewishesfortheNewYear.
____OverhundredsofyearstheEarthgetshotterandthenitgetscolderagain.Butscientistsaresurethatwhat'shappeningnowisdifferent.Theworldisgettingwarmer.Forexample,thewayweuseenergyfromcoalandoilismakingtheplanethotter.Thisisonecauseofclimate(气候)change—it'sman-made.
____Sometimes,goodthingshappenbecauseofmistakes.OnceIgotonthewrongtrain.Thatwasabigmistake.ButIsawagoodfriendonthattrain.IwasgladImadethatmistake!Whenagoodthingcomesoutofamistake,that'sahappyaccident.
B.Theplasticbagproblem
C.NewYearinBrazil
D.Makingmistakesisnotalwaysbad
F.Mychildhooddream