This is a 3—d printer.and this is an artifical ear.

This is a 3—d printer.and this is an artifical ear. This is a book ( )and book is new A.an B.a C.the D./ This is my ear.是什么意思 No information is available for this printer This is a banana and that is an is / this / ear / my .怎么拼成句子 this is my ear的复数形式 This is an eraser That is a this is an onion and that is --- beef 横杠上添a an 还是/ These are an apple and a pear.还是This is an apple and a pear. This is a pen and that’s an eraser.可不可以写成This is a pen and t This is an orange and that is a ruler. 这里的and是什么意思?