单项选择题
Dating from around A. D. 1000,the largest mound surviving from the Mississippian
culture
was one hundred feet high and had a base of nearly fifteen acres.
A．civilization
B．formation
C．sect
D．edifice
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单项选择题
American children customarily go trick-or-treating on Halloween.
A．gaily
B．traditionally
C．readily
D．inevitably
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单项选择题
Meteorologists are at odds over the workings of tornadoes.
A．mystified
B．in disagreement
C．up in arms
D．in disarray
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