填空题 Good presentation is an essential ing 1 of effective communication, but that is not all—clarity of thought, understanding of subject, equal respect for the audience are equally important.
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【正确答案】 1、ingredient    
【答案解析】[译文] 好的表达能力是有效交流的必备因素，但并不是全部——清晰的思维，对话题的理解，谈话双方彼此相互的尊重都一样重要。