单项选择题What was the characteristic of British detective fiction beginning in the 1920s
单项选择题According to Trofimov, who most often do harbor the extremist ideas
单项选择题Concerning the book, which of the following statements is NOT true
单项选择题As far as the problem of Faith at War is concerned, which conclusion can NOT be drawn from the passage
单项选择题About the operation ______.