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
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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