P1 background Image of West desert--mostly by East authors,
P2 the image specifically in northeast part, exclusively from elite in West
P3 the image is too simple
P4 P5 examples1840 immigration leads to the correction of image.
用时7:30 DBA
第三段末尾句子不全,应该是:To claim the universal acceptance of stereotyped images of the Great Plains is to ignore the presence of a considerable array of data to the contrary.