This is a ruler and That a ruler ,too和That is aruler and This is a ruler,too那个对,为什么

翻译：and this is a ruler This is a long ruler,and that is a short( )A.it B.one C.ruler This is a ruler and That a ruler ,too和That is aruler and This is a ruler,too那个对,为什么 This is a ruler(对a ruler提问) ----- -----this? This is an orange and that is a ruler. 这里的and是什么意思? This is a red ruler 用a red ruler 提问 This is a blue jacket.And that ruler is bThis is a blue jacket.And that ruler is blue.为什么要用a blue和blue? This is a ruler 改为一般疑问句 This is a ruler改为一般疑问句 Is this a ruler.(做否定回答) is,a,this,red,ruler 连成句 this is a ruler 改为复数 this ruler is-----?a:myb:mine this is a ruler.改复数 Whis is this?回答A：This is ruler.B：It is a ruler. this is my pen.and that ruler is () too. Is this a ruler.---Yes,this is.（改错） This is a penil.Its red.And this is a penil,too.Its yellow.This is a ruler.ItS biue and whit