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题库 / GMATAdvanced-CR-33
The recycling of municipal solid waste is widely seen as an environmentally preferable alternative to the prevailing practices of incineration and of dumping in landfills. Recycling is profitable, as the recycling programs already in operation demonstrate. A state legislator proposes that communities should therefore be required to adopt recycling and to reach the target of recycling 50 percent of all solid waste within 5 years.
Which of the following, if true, most seriously calls into question the advisability of implementing the proposal?
Existing recycling programs have been voluntary, with citizen participation ranging from 30 percent in some communities to 80 percent in others.
Existing recycling programs have been restricted to that 20 percent of solid waste that, when reprocessed, can match processed raw materials in quality and price.
Existing recycling programs have had recurrent difficulties finding purchasers for their materials, usually because of quantities too small to permit cost-effective pickup and transportation.
Some of the materials that can be recycled are the very materials that, when incinerated, produce the least pollution.
Many of the materials that cannot be recycled are also difficult to incinerate.
P : Recycling is economically viable and profitable.
C: 50% of solid waste should be recycled
【削弱】方案的可行性
B. 现有的回收计划仅限于 20% 的固体废物，这些废物在再加工时 可以在【质量和价格quality and price】上 与加工后的原材料相匹配。（√）
这表明，将可回收的固体废物的百分比提高到 50% 可能会导致 大量回收、再加工的【劣质】材料。
如果这种材料在质量和价格上无法与加工材料匹配，这可能会使回收计划【不再有利可图not profitable】，属于【削弱】方案的的可行性。
C. 现有的回收计划经常难以为他们的材料寻找买家，通常是因为[材料数量太少quantities too small ] 而无法进行具有成本效益的拾取和运输。（×）
现在新措施（50% 的固体废物）实行后，则材料数量会变大，所以方案更可行了，属于【加强】方案的的可行性。
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