31.The remarkable similarity of Thule artifacts from Alaska to Greenland can, in part, be explained as a very rapid movement of people from one end of North America to the other. (A) The remarkable similarity of Thule artifacts from Alaska to Greenland can, in part, be explained as (B) Thule artifacts being remarkably similar from Alaska to Greenland, one explanation is (C) That Thule artifacts are remarkably similar from Alaska to Greenland is, in part, explainable as (D) One explanation for the remarkable similarity of Thule artifacts from Alaska to Greenland is that there was (E)From Alaska to Greenland Thule artifacts are remarkably similar, with one explanation for this being
正确答案是D,OG答案说A选项的意思是similarity就是a rapid movement of people,可是我觉得很难理解,求大神指教!
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