单项选择题

Which is NOT one of the main keys to recycling as mentioned in the passage

A．Government regulation of waste.
B．A more informed public.
C．Better technology.
D．More demand for recycled materials.
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单项选择题
According to the passage, the demand for recyclable materials in the manufacturing of new products is sometimes sluggish because ______.
A．some governments are unwilling to support expensive recycling methods
B．there is a lack of advanced technology to process the materials
C．businesses do not invest enough money into research
D．people don't like waste things
单项选择题
According to the article, paper materials that arc difficult to recycle include ______.
A．copy paper
B．document shred
C．food wrappers
D．bottles and cans
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