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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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热门试题

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

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