单项选择题

One of the most damaging plant parasites is the stem eelworm.

A．harmful
B．elegant
C．dangerous
D．prevalent
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单项选择题
In ancient times the custom of shaking hands served to transfer power or authority.
A．practice
B．folklore
C．culture
D．doctrine
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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