英语四级六级阅读练习（9）：全球垃圾处理速度赶不上塑料包装的制造速度

1. it is durable, flexible, it does not shatter, it can breathe (or not) and it is extremely lightweight. Therefore, food and drink are protected from damage and kept for lengths of time previously unimaginable.

2. Because there are so many types and because it is difficult to remove contamination.