Unit 7 Tall BuildingsPart A,bridge,桥,computer room,art room,living room,teachers office,music room,library,序数词,数词,基数词 表达数目的多少,序数词 表达顺序的先后,英语中的序数词第1至第12除first，second，third有特殊形式外，其余由基数词加后缀th组成，注意第5和第12的拼写，要把基数词five和twelve词尾ve改成f然后加th,序数词的（abbreviation）缩写形式,1.Which floor do you live on？On the .floor,first,1.Which floor do you live on？On the .floor,second,1.Which floor do you live on？On the .floor,third,1.Which floor do you live on？On the .floor,fourth,1.Which floor do you live on？On the .floor,fift
