填空题 A really powerful speaker can work 1 the feeling of the crowd to a fever of excitement.
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【正确答案】 1、up    
【答案解析】解析： A really(真正地) powerful(有力的) speaker(演说者) can work up(激发，激起)the feeling(情绪)of the crowd(人群) to a fever(使兴奋) of excitement(兴奋/激动). 极度兴奋