对话原文
Unit 56 Returns and exchanges
第56课 退款与更换
Most stores in America have return and exchange policies.If, for instance, you buy a shirt and find out when you try it on that it's too small, you can take it back to the store and exchange it for a larger size. At many stores it is also possible to return items for a refund, though there is usually a time limit. Also, not all items can be returned. Books, swimsuits and CDs ( if they' ve been opened), for example, cannot be returned. When you make a purchase, it's always a good idea to find out the store's return and exchange policy.

美国大部分的商店都有退款和更换的规定。举例来说，如果你买了一件衬衫，试穿时却发现太小了，就可以把它拿回店里换尺寸大一点的。很多商店也允许退还商品并退钱，不过这有时间限制。并非所有的物品都可被退还，例如：书、泳衣和CD (假如它们已经被打开了)就不能被退还。当你在买东西时，通常的好点子就是弄清楚商店退货或退款的规定。

重点词汇
1．return n．vt．归还；返回；恢复
例：Please return my book as soon as possible.
（请尽快把书还我。）
2．exchange n．& vt．交换；交易
例：I'd like to exchange this shirt for one in a larger size.
（我想把这件衬衫换成大一点的。）
3．policy n．政策；规定
例：What is the government's policy on this issue?
（对这个问题政府的政策是什么？）
4．refund n．退款；退还
例：If your new radio doesn't work, you should take it back for a refund.
（如果你的新收音机不能用，你应该把它拿回去要求退款。）
5．purchase n. & vt. 购物，采购
例：Henry purchased several items at the jewelry store.
（亨利在那家珠宝店买了几样东西。）