Unit15WelcometoSanFrancisco预习导学学习本单元所掌握的重点知识单词（四会要求）Trolleybus,normally,quick,line,bridge,rather,public,narrow,advantage,advise,market,debate,engine,speed,bay,streetcar,connect,district,railway,trip,wise,include短语：1
advisesb
nottodosth
enjoyourgoodpublictransit3
old-timetrolleys4
travelupanddownMarket5
thecenterofmanyofdebates6
thebuttofmanyjokes
dependon8
thespeedofthecable9
5milesanhour10
nevermore,neverless11
offerawideviewofthecityandbay12
suchas13
makeanothersuggestion
Dressinginlayers14
awisedecision15
makeup16
manydifferentkindsofweather句型：WouldyouliketocometoSanFranciscoforavisit
NovisittoSanFranciscoiscompletewithouttakingarideonacablecar阅读文章总结一下说明文的写作方法
