prep2 14篇有关map的一道题，文章不长 求哪位高手指点一下

Maps made by non-Native Americans to depict Native American land tenure, resources, and population distributions appeared almost as early as Europeans' first encounters with Native Americans and took many forms:  missionaries' field sketches, explorers' drawings, and surveyors' maps, as well as maps rendered in connection with treaties involving land transfers. Most existing maps of Native American lands are reconstructions that are based largely on archaeology, oral reports, and evidence gathered from observers' accounts in letters, diaries, and official reports; accordingly, the accuracy of these maps is especially dependent on the mapmakers' own interpretive abilities.

Many existing maps also reflect the 150-year role of the Bureau of Indian Affairs (BIA) in administering tribal lands. Though these maps incorporate some information gleaned directly from Native Americans, rarely has Native American cartography contributed to this official record, which has been compiled, surveyed, and authenticated by non-Native Americans.  Thus our current cartographic record relating to Native American tribes and their migrations and cultural features, as well as territoriality and contemporary trust lands, reflects the origins of the data, the mixed purposes for which the maps have been prepared, and changes both in United States government policy and in non-Native Americans' attitudes toward an understanding of Native Americans.

The passage suggests which of the following about most existing maps of Native American lands?

(A) They do not record the migrations of Native American tribes.
(B) They have been preserved primarily(主要的，primitive原始的) because of their connection with treaties involving land transfers.
(C) They tend to reflect archaeological evidence that has become outdated.
(D) They tend to be less accurate when they are based on oral reports than when they are based on written documents.
(E) They are not based primarily on the mapmakers' firsthand observations of Native American lands.
选项为D 此处没有看到比较啊？C为什么不对，定位应该是 Most existing maps of Native American lands are reconstructions that are based largely on archaeology, oral reports, and evidence gathered from observers' accounts in letters, diaries, and official reports; accordingly, the accuracy of these maps is especially dependent on the mapmakers' own interpretive abilities.
里面有说reconstruction，重建，应该就是 过时了吧？还有D项中when they are based on written documents.
没有跟写的内容的比较啊？
困惑中，诚心求助，谢谢！

Maps made by non-Native Americans to depict Native American land tenure, resources, and population distributions appeared almost as early as Europeans' first encounters with Native Americans and took many forms:  missionaries' field sketches, explorers' drawings, and surveyors' maps, as well as maps rendered in connection with treaties involving land transfers. Most existing maps of Native American lands are reconstructions that are based largely on archaeology, oral reports, and evidence gathered from observers' accounts in letters, diaries, and official reports; accordingly, the accuracy of these maps is especially dependent on the mapmakers' own interpretive abilities.

Many existing maps also reflect the 150-year role of the Bureau of Indian Affairs (BIA) in administering tribal lands. Though these maps incorporate some information gleaned directly from Native Americans, rarely has Native American cartography contributed to this official record, which has been compiled, surveyed, and authenticated by non-Native Americans.  Thus our current cartographic record relating to Native American tribes and their migrations and cultural features, as well as territoriality and contemporary trust lands, reflects the origins of the data, the mixed purposes for which the maps have been prepared, and changes both in United States government policy and in non-Native Americans' attitudes toward an understanding of Native Americans.

The passage suggests which of the following about most existing maps of Native American lands?

(A) They do not record the migrations of Native American tribes.
(B) They have been preserved primarily(主要的，primitive原始的) because of their connection with treaties involving land transfers.
(C) They tend to reflect archaeological evidence that has become outdated.
(D) They tend to be less accurate when they are based on oral reports than when they are based on written documents.
(E) They are not based primarily on the mapmakers' firsthand observations of Native American lands.
选项为D 此处没有看到传世私服比较啊？C为什么不对，定位应该是 Most existing maps of Native American lands are reconstructions that are based largely on archaeology, oral reports, and evidence gathered from observers' accounts in letters, diaries, and official reports; accordingly, the accuracy of these maps is especially dependent on the mapmakers' own interpretive abilities.
里面有说reconstruction，重建，应该就是 过时了吧？还有D项中when they are based on written documents.
没有跟写的内容的比较啊？
困惑中，诚心求助，谢谢！