This is an orange and that is a ruler. 这里的and是什么意思?

This is a orange orange.This is an orange orangeThis is a orange orange.This is an orange orange.请问哪句正确? This is an orange改为复数句 This is an orange.改为复数句. this is an orange改复数句 This is an orange改为复数句 This is an orange .[改为复数句] is this an orange?(做出否定回答) This is an orange and that is an( ) This is an orange orange.的同义句 this is an orange.it is orange.为什么第一个加an,而第二个不加an this is an orang对an orange进行提问 this an is orange jacket连句用 this an is orange jacket 连成一句话 An orange is orange是什么意思 用A,an,The填空：This is ( )orange.( )orange is ( )orange.可以空着 Everyone knows that () is (). A.orange/orange B.an orange/orange C.an orange/an orange This is an orange.画线：“an orange”对该部分提问 orange is orange an orange is orange 那种说法对? this is an orange.( )oeange is ( ) orange“A；a”“The；/”“An；a”“A；an” 选一组填在括号内