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一、pet compact教材特点 pet compact一书为剑桥大学考评部主编，适合中长线备考的考生。 本书分为8单元，每单元一个话题，以话题内容串联全书，贯穿学习、生活、娱乐、活动等，. Polyethylene terephthalate (pet) plastic is used today in textile fibers, packaging materials as disposable or reusable bottles.
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