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
查看答案
正确答案
试题解析
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。