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单选题
The key problem in dealing with returned plastic beverage containers is _____.
A

to sell them at a profitable price

B

how to turn them into useful things

C

how to reduce their recycling costs

D

to lower the prices for used materials


参考答案

参考解析
解析:
细节推断题。第二段提到,直到现有的经济的废物处理方法给了它第二次生命的价值,即让它变成有用的东西,否则它就会一直是垃圾。这与B项意思相同,故B项正确。
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