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
In some cases, recycling could be hazardous to the environment if special precautions are not taken because ______.
A．industrial emissions are sometimes created in the process
B．chemical waste is sometimes produced as a result
C．a great deal of energy is expended to create new products
D．there are a lot of bacteria in waste things
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