答案：1.briefly;2.brief;3.abbreviated;4.brevity;5.abridged
译文：1.她以平淡的语气简短地报告了这件事。
2. 9月缩写为Sep。
3.音乐会开得很短，这使观众感到失望。
4.他为演讲起了一个草稿。
5.为便于学生理解，很多学校采用长篇小说的缩减本。
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