first floor、second floor……几层几层前面用介词at 还是in?

first floor、second floor……几层几层前面用介词at 还是in? Usually,Americans call the ____ floor the ___ floor.A.ground...first.B.second...ground.C.ground...basement.D.second...first the ground floor is many children's favourite the first floor and second floor are thesupermarket,the ground floor到底怎么译 They live on the second floor,and we live on the first floor.We live____them.(A).below(B).under The first floor is a bathroom.The second floor are kate's and Maria's rooms.这句话对? second floor怎么读 second floor怎么读 second floor怎么读 at the second floor 还是on the second floor I live on the first floor and they are second想说我住一楼 他们住2楼 说法对吗 ______classroom is on the first floor._____is on the second floora.our,their b.ours,their c.our,theirs The windows are on the first and second floor,and are very tall,这句子有错吗 second floor是词组吗 second floor是词组吗 连词组句Is/naughty/Daming/in/class/his/?you/on/floor/Were/the/second/?were/on/We/first/the/.floor/. first floor怎么读 in the first floor first floor怎么读