this is an order.中is 和an要连读吗?

this is an order.中is 和an要连读吗? This is an order是什么 速求：：This is order?还是This is an order? an order of 和 this is an order 这两个怎样连读? Is this an egg? Is this an eye? This is an orange this is an easy this is an is this an apple an orange__an egg for the heart you made can only give me this is an order this document is an official copy of the purchase order spec