根据短文内容，从短文后的选项中选出能填入空白处的最佳选项．选项中有两项为多余选项．
Theartofgrowingdwarftrees，or"bonsai"（盆景）astheirJapaneseplanterscallthem，isincreasinginpopularityintheUnitedStates．Growingbonsaicanmakeafascinatinghobbyforanyonewhoenjoysplantsandcreatingbeautifuleffectswiththem．（36）___
Ingrowingbonsai，infact，onemustbecarefulinchoosingthetypeoftree，asthegrowingconditionsareunusual（37）___Varietiesofpineswithsmallneedlesandhardwoodtrunksareespeciallysuitable．（38）___Thisisnecessarybecausethemajorgrowthofbonsaiiskeptconfined（被限制）tothetree'strunkandleaves，notitsrootsystem-aprocessquiteunlikewhatisdonewithotherplants．Anotherthingthebonsai-growermustdoistotrim（修整）therootsandbranchesofthetreeperiodically（定期地）．Unlessthisisdone，theplantswillnothavetheproperproportions（比例）andwilllookunnatural．（39）___Thelastthingonemustdoistobecarefultokeepthetreewell-watered．Becausebonsaiaregrowninsmaller-than-usualcontainers，theyoftenneedmorewaterthanordinaryhouseplantsdo．
Ascanbeseenfromtheabove，theartofbonsai-growingisonewhichrequiresacertainamountoftimeandeffort．（40）___Imaginehavingsuchatreeinyourlivingroomandpassingitdownthroughseveralgenerationsofyourfamily．Thatisexactlywhatbonsai-growingisallabout：establishingatraditionofbeautywhichlastsforyearsandyearsandisasymbolofthebeautiesofthenaturalworld．
A．Thenonemustbecarefulinchoosingthesizeofthecontainer．
B．Howcanwemeetthegoalofmakingsuchakindofart？
C．Whydosomanypeopletakeafancytotheartofbonsai-growing．
D．Butonemustgetwellpreparedbeforestartingbonsai-growing．
E．Thesatisfactionsthatgrowingbonsaibringscanbegreat，however．
F．Theidealforbonsaiplantsaretreesjustlikenormaltreesineverythingbutsize．
G．Notallspeciesoftreescanbemadeintobonsai．