单项选择题

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

A．abandoned
B．limited
C．secured
D．spoiled
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单项选择题
The proper title 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
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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