Cantreestalk?Yes,butnotinwords.Scientistshavereasontobelievethattreesdocommunicatewitheachother.Notlongago,researcherslearnedsomesurprisingthings.Firstawillowtreeattackedinthewoodsbycaterpillars(毛虫)changedthechemistryofitsleavesandmadetheirtastesoterriblethattheygottiredoftheleavesandstoppedeatingthem.Thenevenmoreastonishing,thetreesentoutaspecialsmell----asignal(信号)causingitsneighborstochangethechemistryoftheirownleavesandmakethemlesstasty.Communication,ofcourse,doesn'tneedtobeinwords.Wecantalktoeachotherbysmiling,raisingourshouldersandmovingourhands.Weknowthatbirdsandanimalsuseawholevocabularyofsongs,soundsandmovements.Beesdancetheirsignals,flyingincertainpatternsthattellotherbeeswheretofindnectar(花蜜)forhoney.Sowhyshouldn'ttreeshavewaysofsendingmessage?31.Itcanbeconcludedfromthepassagethatcaterpillarsdonotfeedonleavesthat______.
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Allaroundtheworld,peopledrinktea.Butteadoesn'tmeanthesamethingtoeveryone.Indifferentcountriespeoplehavedifferentideasaboutdrinkingtea.PeopleinChinaliketodrinkteawithnothinginit,andtheyoftenhaveitwiththeirfriendsorbythemselves.Theyhavetwokindsoftea,greenteaandblacktea.Theymaydrinkteaatanytimeofthedayanywhere.Buttheydon'toftendrinkteajustbeforetheygotobed,becauseteamakesthemawake.InEngland,peopleliketodrinkteawithmilkandsugarinit,andtheyoftenhaveitintheafternoonwiththeirfriends.InJapan,peoplealsolikedrinkingteaverymuch.Itisverypopularthere.Theydrinkteaeveryday.TheyhaveitinawaydifferentfromthatinChina.SomeyoungJapanesegirlsaregoodatmakingtea.Theycandoitbeautifully.IntheUSA,peopledrinkteaatbreakfastoraftermeals.Theyusuallyuseteabagstomaketheirtea.Makingteawithteabagsisfasterandeasierthanmakingitwithtealeavesinteapots.21.Chinesepeopleliketodrink_______.
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