填空题

Basically, there are two problems with regard to recycling: one is; the other .

【参考答案】

usability of rccycled materials/cost of recovery

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填空题

Recycling goes so smoothly in Japan that most of its household trash, such as paper, glass and metal can be reused in one way or another.

填空题

In Germany, the government has laid down a strict law that more recycled materials should be used in all manufacturing industries.

Basically, there are two problems with regard to recycling: one is______; the other ______.