如题，执行WorkBooks[2].Close很慢
操作如下：
xlApp.WorkBooks.add;
xlApp.WorkBooks.Open(ExtractFilePath(Application.ExeName)+'1.xls');

xlapp.WorkBooks[2].activate;
xlapp.WorkBooks[2].WorkSheets[1].activate;
xlapp.ActiveSheet.UsedRange.Copy;
xlapp.WorkBooks[1].WorkSheets[1].Paste;
xlapp.WorkBooks[2].close; //超慢

请各位帮帮忙。