【答案与解析】本文是一篇应用文。文章七要介绍了几种最常见的可回收及不可回收的塑料垃圾。
21.C推理判断题。根Plastic film一节中“The thin and soft film gets stuck around the equipment and canbring its operation to i stop.”及Plastic bags一节中“Plastic bags...create smilar problems for recyclingmachinery as thin plastic film.”可推断,这两种包装塑料都太薄、太软。会卡住加工设备。
22.B细节理解题。根据Beverage(饮料)bottles一节中“.-thcy're made from one kind of plastic thatrecyclers can easily sell for making products such as carpet,'elothing or even more plastic bottles.”可知,饮料瓶是由单一种类的塑料制成的,所以容易回收利用
23.A细节理解题。根据最后一节中“Therefore,it's more important for us to reduce packaging.”可知,作者希望大家尽量减少包装。

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