单项选择题

Dating from around

A．D. 1000,the largest mound surviving from the Mississippian <u>culture</u>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

The last mayor was assassinated when he was fifty years old.

A．honored
B．murdered
C．elected
D．impeached

单项选择题

I would like your authorization to trim the part of the tree that hangs into my yard.

A．sanction
B．encouragement
C．approval
D．attention