单项选择题

According to this passage, chemistry ______.

A．produces more harmful effects than beneficial ones
B．produces no more harmful effects than beneficial ones
C．is no longer unanimously regarded as the science of the future
D．is not worth pursuing persistently

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单项选择题

The underlined word tainted in the first paragraph most probably means ______.

A．abandoned
B．limited
C．secured
D．spoiled

单项选择题

The third paragraph is mainly about ______.

A．the harmful effects of chlorofluorocarbons on the environment
B．the necessity to ensure the environmental compatibility of new chemical substances
C．the economic feasibility of new chemical substances
D．the objective assessment of the progress in chemistry