3. According to the passage, which of the following is true of Keyssar’s findings concerning unemployment in Massachusetts?
(A) They tend to contradict earlier findings about such unemployment.
(B) They are possible because Massachusetts has the most easily accessible historical records.
(C) They are the first to mention the existence of high rates of geographical mobility in the nineteenth century.
(D) They are relevant to a historical understanding of the nature of unemployment in other states.(D)
(E) They have caused historians to reconsider the role of the working class during the Great Depression.
D选项对应原文什么内容? |