The main purpose of the research was to find out
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The main purpose of the research was to find out how exposure to PAHs played a role in har-ming the subjects’ physical health.
A.Right
B.Wrong
C.Not mentioned
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答案：B
根据第二段“The researchers wanted to probe（探查）other sources of PAHs, ones that’s would have been hard for an individual to avoid.”可知，研究的目的是找出除香烟外其他能排放多环芳烃的原料。题干陈述的是所有可以排放多环芳烃的原料，与原文不符。故选B。