DEALING WITH WASTE PLASTIC Every year people throw away millions of tonnes of plastic bottles, boxes and wrapping. These cr

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问题                             DEALING WITH WASTE PLASTIC
   Every year people throw  away  millions of tonnes of plastic bottles, boxes and wrapping. These create huge mountains of waste 【C1】______ are extremely hard to get 【C2】______ of. Now, a new recycling process promises to reduce this problem by turning old plastic 【C3】______ new.
   Scientists have taken 【C4】______ long time to develop their ideas because waste plastic has always been a bigger problem 【C5】______ substances like waste paper. You can bury plastic, but it is years 【C6】______ it breaks down. If you burn it, it just becomes another form of pollution. A 【C7】______ products, for example bottles, can be re-used but it is expensive or difficult to do this 【C8】______ a lot of plastic products.
   Now a group of companies has developed a new method 【C9】______ recycling that could save almost 【C10】______ plastic waste. The advantage of the new process is that nearly every type of waste plastic can be used: it does 【C11】______ have to be sorted. In addition, labels and ink may be left 【C12】______ the products. Everything is simply mixed together 【C13】______ heated to more than 400 degrees centigrade 【C14】______ that it melts. It is then cooled, producing a waxy substance that can be used to make new plastic products such as bags, bottles and, among 【C15】______ things, computer hardware.
【C5】______

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答案than

解析 根据上下文,为比较,故用than。
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