2. 考研
  3. Paper is different from other waste produce because it comes from a sustainable resource: trees. (21) the minerals and oil used

Paper is different from other waste produce because it comes from a sustainable resource: trees. (21) the minerals and oil used

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问题     Paper is different from other waste produce because it comes from a sustainable resource: trees. (21) the minerals and oil used to make plastics and metals, trees are (22) . Paper is also biodegradable, so it does not pose as much threat to the environment when it is discarded. (23) 45 out of every 100 tones 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 (24) since the world-wide average is 33 percent waste paper. Governments have encouraged waste paper collection and (25) schemes and at the same time, the paper industry has responded by developing new recycling technologies that have (26) even greater utilization of used fibre. (27) , industry’s use of recycled fibres is expected to increase at twice the rate of virgin fibre over the coming years.
    Already, waste paper (28) 70% of paper used for packaging and advances in the technology (29) to remove ink from the paper have allowed a higher recycled (30) in newsprint and writing paper. To achieve the benefits of recycling, the community must also (31) . We need to accept a change in the quality of paper products; (32) stationery may be less white and (33) a rougher texture. There also needs to be (34) from the community for waste paper collection programs. Not only do we need to make the paper (35) to collectors but it also needs to be separated into different types and sorted from contaminants such as staples, paperclips, string and other miscellaneous (36) .
    There are technical (37) to the amount of paper which can be recycled and some paper products cannot be collected for reuse. These include paper (38) books and permanent records, photographic paper and paper which is badly contaminated. The four most common (39) of paper for recycling are factories and retail stores which gather large amounts of packaging material (40) goods are delivered, also offices which have unwanted business 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.

选项 A、While
B、When
C、If
D、Because
答案A
解析 本题测试语法。while引导让步状语从句；when引导时间状语从句；if引导条件状语从句；because引导原因状语从句。前面的句子说的是45 out of every 100 tones of wood fibre comes from waste paper，而后面的句子说的是the rest comes directly from virgin fibre，强调的是后面的句子，所以前面的句子表示让步。应该选A。
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