单项选择题
According to the article, paper materials that are difficult to recycle include ______.
A．copy paper
B．document shred
C．food wrappers
D．bottles and cans
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单项选择题
What would be the best title for this passage
A．Important Keys to Recycling Paper
B．Technological Advances Improve Recycling
C．Steps to Improving Recycling
D．Best Ways to Protect Our Environment
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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
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