单项选择题

What is the author's attitude towards animal research

A．Negative.
B．Questioning.
C．Neutral.
D．Positive.
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单项选择题
Which is NOT one of the main keys to recycling as mentioned in the passage
A．Government regulation of waste.
B．A more informed public,
C．Better technology.
D．More demand for recycled materials.
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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