单项选择题

The passage is mainly concerned with ______.

A．supporting a position
B．refuting some arguments
C．describing a case
D．presenting a new perspective
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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
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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