单项选择题

The proper rifle for this passage should be ______.

A．The Positive Impact of Chemistry
B．The Harmful Effects of Chemicals
C．Progress in Chemistry
D．Chemistry and Society

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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

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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