单项选择题

The (scientific) revolution of the early 1900s (affected) education by (change) the nature of (technology).（）

A．scientific
B．affected
C．change
D．technology

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单项选择题

New York City's first large electric sign, (which was) over six stories (high) and topped by a (forty-feet-long) green signboard, (appeared) on the side of a building in 1900.（）

A．which was
B．high
C．forty-feet-long
D．appeared

单项选择题

New (technical) in the 1970s led to the (popular) digital watch and digital clock, (which) displayed the time and often the day, (date), and elapsed time.（）

A．technical
B．popular
C．which
D．date

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