单项选择题 听力原文：M: Excuse me. Would you happen to know where the post office is? I was told that it was around here somewhere, but I can't seem to find it. W: The post office you're looking for used to be right here next to the stationery store, but it moved to the corner of Sunset Road and Elm Street a couple of weeks ago. If you want to go there, just walk straight down this road until the next intersection. Turn right, and walk two blocks until you see the brown building on the northwest corner. M: Thanks a lot. And, would you happen to know what time it closes, by the way? I heard the closing time is at 4 o'clock. W: As far as I know, they're open until 4:30. Yes, I'm sure they are open now. I was there the other day, and t remember looking at my watch. It was 4:20 at the time.Where is the conversation taking place?A．In a stationery store.B．In a post office.C．On a street.D．At city hall.

未知题型 关于施工质量计划，下列说法正确的是（ ）。－－P182

未知题型 在下图所示的树型文件系统中，方框表示目录，圆圈表示文件，“/”表示路径中的分隔符，“/”在路径之首时表示根目录。图中，(10)。 假设当前目录是D1，进程A以如下两种方式打开文件f1。 ① fd1=open(' (11) /fl',o_RDONLY); ② fd1=open('/D1/W1/f1'，o_RDONLY); 其中，方式①的工作效率比方式②的工作效率高，因为采用方式①的文件系统(12)。A．子目录W2中文件f2和子目录D2中文件f2是完全相同的B．子目录W2中文件f2和子目录D2中文件f2是不相同的C．子目录W2中文件f2和子目录D2中文件f2可能相同也可能不相同D．树型文件系统中不允许出现相同名字的文件