在Excel表处理中，假设单元格A1=1，A2=1.5，选择A1:A2单元格区域，并将鼠标指针指向该区域右下角的填充柄，拖动至A8单元格，则A8=______；之后，在单元格B1中输入公式“=SUM(A1:$A$8)”，则B1所显示的内容是______。 When saving a document you must decide on a name for the document and the ______ where it willbe saved to．

单项选择题DBMS will manage the stored data items and assembIe the needed items from the ______ databasein response tO the querieS of those who aren’t pmgrammers.

单项选择题______ is a device which enables digital microcomputers to communicate across analog telephonelines．