( )不是 Unix 系统的特色。
A、“交互的分时系统”A
暂无解析
Aleading___________intelligenceandoperationscompanyhasreleaseditsanalysisofworldwidereportedincidentsofpiracyandcrimeagainstmariners.
Itisnecessarythatthestudents____moreexcercisestodo.
Itisnotuncommonforthere_____problemsofcommunicationbetweentheoldandtheyoung.
HismannerwassopleasantthatBollafeltat（）withhimatonce.
Writing：
Anoldsayinggoes“hastmakeswaste”.Writeacompositionofabout400wordstostateyourviewonit.
