题干KW：suggest "past research"（推断题）
B. familiar，willing 无关比较
D. bought products from a particular manufacturer before 无关比较
E. less impact than 无关比较
3. However, past research suggests that the relationship between source' credibility and perceived performance risk may be more complex： source credibility may interact 'with price in subtle way to affect consumer’s judgments of the performance risk associated with an advertised product.
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