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  3. Paper is different from other waste produce because it comes from a sustainable resource: trees.【C1】______the minerals and oil u

Paper is different from other waste produce because it comes from a sustainable resource: trees.【C1】______the minerals and oil u

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问题     Paper is different from other waste produce because it comes from a sustainable resource: trees.【C1】______the minerals and oil used to make plastics and metals, trees are【C2】______Paper is also biodegradable, so it does not pose as much threat to the environment when it is discarded.【C3】______45 out of every 100 tonnes of wood fibre used to make paper in Australia comes from waste paper, the rest comes directly from virgin fibre from forests and plantations. By world standards this is a good【C4】______since the world-wide average is 33 percent waste paper. Governments have encouraged waste paper collection and【C5】______schemes and at the same time, the paper industry has responded by developing new recycling technologies that have【C6】______even greater utilization of used fibre.【C7】______. industry’s use of recycled fibres is expected to increase at twice the rate of virgin fibre over the coming years.
    Already, waste paper【C8】______70% of paper used for packaging and advances in the technology【C9】______to remove ink from the paper have allowed a higher recycled【C10】______in newsprint and writing paper. To achieve the benefits of recycling, the community must also【C11】______. We need to accept a change in the quality of paper products;【C12】______stationery may be less white and【C13】______a rougher texture. There also needs to be【C14】______from the community for waste paper collection programs. Not only do we need to make the paper【C15】______to collectors but it also needs to be separated into different types and sorted from contaminants such as staples, paperclips, string and other miscellaneous【C16】______.
    There are technical【C17】______to the amount of paper which can be recycled and some paper products cannot be collected for reuse. These include paper【C18】______books and permanent records, photographic paper and paper which is badly contaminated. The four most common【C19】______of paper for recycling are factories and retail stores which gather large amount of packaging material【C20】______goods are delivered, also offices which have unwared documents and computer output, paper converters and printers and lastly households which discard newspapers and packaging material. The paper manufacturer pays a price for the paper and may also incur the collection cost.
【C20】
选项 A、to which
B、in which
C、by which
D、through which
答案B
解析 本题测试语法。所填之词引导定语从句修饰factories and retail stores，指的是地点，所以应该选B。
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