( )备份是指对整个系统或用户指定的所有文件数据进行一次全面的备份。
参考答案：完全
A big earthquake struck southem Haiti, knocking down buildings and power lines and causing _____ its
ambassador to the United States called a catastrophe. [ ]
A. what
B. which
C. that
D. why
怎样理解文学接受是一种审美认识活动？
