at the first floor还是on the first floor

at the first floor还是on the first floor the first floor究竟是指一楼还是二楼? my classrom is ?the first floor 答案是on还是at at the second floor 还是on the second floor “住在第一层”是live on the first floor还是live on first floor in the first floor first floor、second floor……几层几层前面用介词at 还是in? The canteen is the first floor.A.onThe canteen is the first floor.A.on B.at C.in填空 是用on the first floor 因为floor是名词 那at呢 是用on the first floor 因为floor是名词 那at呢? you should sweep the floor first 改成被动语态是the floor should be swept by you first还是the floor should be swept first by you?为什么? love at first sight 还是 love at the first sight 高手帮忙at first sight还是at THE first sight? on the first floor是什么意思 The computer room is ( ) the first floor选择题1(on) 2(at) 3(in) 地下一楼用英语怎么说?是 basement level 1 还是 the first basement floor?还是 the first basement on the first day还是in the first day还是at the first? 是it take him down to the first floor 还是 it bring是it take him down to the first floor 还是 it bring him down to the first floor