单项选择题

Cement was seldom used in buildings of the Middle Ages.

A．slightly
B．rarely
C．originally
D．occasionally
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单项选择题
He denies involvementwith either drugs or the CIA.
A．interference
B．interruption
C．intervention
D．interaction
单项选择题
Professor Taylor s talk has indicated that science has a very strong influenceon the everyday life of non-scientists as well as scientists.
A．motivation
B．perspective
C．impression
D．impact
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