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 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
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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
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ending
paraphrasing
outline notes
depicting→depicted。
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