单项选择题
What is the author's attitude towards animal research
A．Negative.
B．Questioning.
C．Neutral.
D．Positiv
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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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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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