【单选题】From the context we may figure out that the word 'plagued' (Paragraph 1) means ______.
【单选题】时分复用系统中所采用的同步旋转开关一秒钟应该旋转 。
【单选题】From the context we can figure out that the phrase 'pass for' in Para graph 3 means ______.
【单选题】From the context we know that Wal-Mart and Target are the names of two ______.