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
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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